docs: Correct trailing spaces in markdown files and add .editorconfig instruction file (#873)

## Description

This PR combines #869, #868, #867 and #866

## Related Issue
Replaces #869, #868, #867 and #866

## Type of Change

<!-- Mark the appropriate option with an "x" -->

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [X] Documentation update
- [ ] Code refactoring
- [ ] Other (please describe):

## Checklist

<!-- Mark completed items with an "x" -->

- [X] I have read the [CONTRIBUTING](CONTRIBUTING.md) guidelines
- [X] My code follows the code style of this project
- [X] I have added tests that prove my fix is effective or that my
feature works
- [X] All new and existing tests pass
- [X] I have updated the documentation accordingly
- [X] My changes generate no new warnings

## Additional Notes

This PR is credited to @reedy who discovered the trailing spaces

Author: DannyvdSluijs

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Fixed
 - UriRetriever: Include actual media type in InvalidSchemaMediaTypeException message ([#872](https://github.com/jsonrainbow/json-schema/pull/872))
+- docs: Correct trailing spaces in Markdown ([#873](https://github.com/jsonrainbow/json-schema/pull/873))
 
 ## [6.6.4] - 2025-12-19
 ### Changed
@@ -56,7 +57,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [6.4.2] - 2025-06-03
 ### Fixed
 - Fix objects are non-unique despite key order ([#819](https://github.com/jsonrainbow/json-schema/pull/819))
-- Id's not being resolved and id property affects sibling ref which it should not do ([#828](https://github.com/jsonrainbow/json-schema/pull/828)) 
+- Id's not being resolved and id property affects sibling ref which it should not do ([#828](https://github.com/jsonrainbow/json-schema/pull/828))
 
 ### Changed
 - Added extra breaking change to UPDATE-6.0.md regarding BaseConstraint::addError signature change ([#823](https://github.com/jsonrainbow/json-schema/pull/823))
@@ -94,7 +95,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Changed
 - replace icecave/parity with custom deep comparator ([#803](https://github.com/jsonrainbow/json-schema/pull/803))
- 
+
 ## [6.2.1] - 2025-03-06
 ### Fixed
 - allow items: true to pass validation ([#801](https://github.com/jsonrainbow/json-schema/pull/801))
@@ -124,7 +125,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Add return types in the test suite ([#748](https://github.com/jsonrainbow/json-schema/pull/748))
 - Add test case for validating array of strings with objects ([#704](https://github.com/jsonrainbow/json-schema/pull/704))
-- Add contributing information, contributor recognition and security information ([#771](https://github.com/jsonrainbow/json-schema/pull/771)) 
+- Add contributing information, contributor recognition and security information ([#771](https://github.com/jsonrainbow/json-schema/pull/771))
 
 ### Fixed
 - Correct misconfigured mocks in JsonSchema\Tests\Uri\UriRetrieverTest ([#741](https://github.com/jsonrainbow/json-schema/pull/741))

README.md

@@ -5,10 +5,10 @@
 [![Total Downloads](https://poser.pugx.org/justinrainbow/json-schema/downloads)](https://packagist.org/packages/justinrainbow/json-schema/stats)
 ![Supported Dialects](https://img.shields.io/endpoint?url=https%3A%2F%2Fbowtie.report%2Fbadges%2Fphp-justinrainbow-json-schema%2Fsupported_versions.json)
 
-A PHP Implementation for validating `JSON` Structures against a given `Schema` with support for `Schemas` of Draft-3, 
-Draft-4 or Draft-6. 
+A PHP Implementation for validating `JSON` Structures against a given `Schema` with support for `Schemas` of Draft-3,
+Draft-4 or Draft-6.
 
-Features of newer Drafts might not be supported. See [Table of All Versions of Everything](https://json-schema.org/specification-links.html#table-of-all-versions-of-everything) to get an overview 
+Features of newer Drafts might not be supported. See [Table of All Versions of Everything](https://json-schema.org/specification-links.html#table-of-all-versions-of-everything) to get an overview
 of all existing Drafts. See [json-schema](http://json-schema.org/) for more details about the JSON Schema specification
 
 # Compliance
@@ -207,7 +207,7 @@ third argument to `Validator::validate()`, or can be provided as the third argum
 | `Constraint::CHECK_MODE_EXCEPTIONS`             | Throw an exception immediately if validation fails              |
 | `Constraint::CHECK_MODE_DISABLE_FORMAT`         | Do not validate "format" constraints                            |
 | `Constraint::CHECK_MODE_VALIDATE_SCHEMA`        | Validate the schema as well as the provided document            |
-| `Constraint::CHECK_MODE_STRICT` [^3]            | Validate the scheme using strict mode using the specified draft | 
+| `Constraint::CHECK_MODE_STRICT` [^3]            | Validate the scheme using strict mode using the specified draft |
 
 [^1]: Please note that using `CHECK_MODE_COERCE_TYPES` or `CHECK_MODE_APPLY_DEFAULTS` will modify your
 original data.

SECURITY.md

@@ -10,4 +10,4 @@
 
 ## Reporting a Vulnerability
 
-JSON Schema uses the GitHub feature to safely report vulnerabilities, please report them using https://github.com/jsonrainbow/json-schema/security 
+JSON Schema uses the GitHub feature to safely report vulnerabilities, please report them using https://github.com/jsonrainbow/json-schema/security

UPGRADE-6.0.md

@@ -30,7 +30,7 @@ Thank you for your support and contributions to the project.
 
 * The signature for the `BaseConstraint::AddError` method has changed.
 
-  The `$message` parameter has been removed and replaced by the `ConstraintError` parameter. 
+  The `$message` parameter has been removed and replaced by the `ConstraintError` parameter.
   The `ConstraintError` object encapsulates the error message along with additional information about the constraint violation.
 
     *Before*