Add documentation

Author: threema-danilo

docs/.gitignore

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+*.log
+site/
+VENV/

docs/Makefile

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+all: html
+
+html:
+	mkdocs build -v

docs/docs/about.md

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+# About SaltyRTC
+
+For more information about the project, please visit
+[saltyrtc.org](http://saltyrtc.org).

docs/docs/custom.css

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+/* Workaround for duplicate headings: https://github.com/mkdocs/mkdocs/issues/318 */
+li.toctree-l3:first-child {
+    display: none;
+}

docs/docs/img/favicon.ico

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+# SaltyRTC Server
+
+This is a SaltyRTC server implementation written in Python 3 with asyncio.
+
+**Contents**
+
+* [Installing](installing.md)
+* [Usage](usage.md)
+* [About](about.md)

docs/docs/index.md

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+# Installing
+
+**Note:** On machines where Python 3 is not the default Python runtime, you
+should use `pip3` instead of `pip`.
+
+## Prerequisites
+
+You need the following packages installed to be able to run the SaltyRTC
+server:
+
+- python3
+- python3-pip
+- libsodium-dev
+
+## Option A: Installing System-Wide
+
+Now install `saltyrtc.server` from [PyPI](https://pypi.python.org/):
+
+    $ sudo pip install saltyrtc.server
+
+## Option B: Installing in a Venv
+
+If you don't want to install saltyrtc-server-python system-wide, we
+recommend using [venv](https://docs.python.org/3/library/venv.html) to create
+an isolated Python environment.
+
+    $ python3 -m venv venv
+
+You can switch into the created virtual environment venv by running this command:
+
+    $ source venv/bin/activate
+
+While the virtual environment is active, all packages installed using `pip`
+will be installed into this environment.
+
+    $ pip install saltyrtc.server

docs/docs/installing.md

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+# Usage
+
+The script `saltyrtc-server` will be automatically installed and provides a
+command line interface for the server. Run the following command to see usage
+information:
+
+    $ saltyrtc-server --help

docs/docs/usage.md

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+site_name: SaltyRTC Server
+site_description: Documentation for saltyrtc-server-python.
+site_author: Lennart Grahl
+copyright: © 2016-2017 Lennart Grahl
+theme: readthedocs
+repo_url: https://github.com/saltyrtc/saltyrtc-server-python
+edit_uri: edit/master/docs/docs/
+markdown_extensions:
+  - smarty
+  - toc:
+      permalink: False
+pages:
+  - Home: index.md
+  - Guide:
+    - Installing: installing.md
+    - Usage: usage.md
+  - About: about.md
+theme_dir: theme_overrides
+extra_css:
+  - custom.css

docs/mkdocs.yml

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+mkdocs==0.16.3
+Pygments==2.1.3