draft of lang contribution guideline

Author: bxngyn

CONTRIBUTING_LANG.md

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+# Check50 Language Translations
+Thank you for your interest in making CS50's tooling more accessible for all. Before contributing, please read this in full to avoid any complications.
+
+## Instructions
+CS50 uses GitHub to host code, track issues and feature requests, as well as accept pull requests. Please do not email staff members regarding specific issues or features.
+
+In order to add or edit a language for `check50`, please follow these steps.
+
+1. Fork the `check50` repository.
+2. Once in the `check50` directory, run `pip install babel` and `pip install -e .`
+3. If the language you are looking to add already exists in `check50/locale/`, please skip to step 6.
+    - See all of the 2 letter language codes [here](https://www.loc.gov/standards/iso639-2/php/code_list.php)
+4. Generate the template of strings to translate by running `python3 setup.py extract_messages`. This will create a file in `check50/locale/` called `check50.pot`
+5. Run `python setup.py init_catalog -l <LANG>`, where `<LANG>` is the 2 letter language code (see [here](https://www.loc.gov/standards/iso639-2/php/code_list.php)), to create a file called `check50.po` located at `check50/locale/<LANG>/LC_MESSAGES/`. This file is where the translations will be inputted.
+6. The original English strings are found at every `msgid` occurence. Translations should be inputted directly under at every `msgstr` occurence.
+7. To test your translations, run `python3 setup.py compile_catalog` to compile the `check50.po` file into `check50.mo`.
+8. `pip3 install .` to install the new version of `check50` containing these translations.
+
+## Design and Formatting
+Please follow the formatting of the `msgstr` English strings. For example, if the `msgid` string is
+
+```
+msgid ""
+"check50 is not intended for use in interactive mode. Some behavior may "
+"not function as expected."
+```
+
+The `msgstr` string should replicate the spacing of the English string.
+
+Example:
+```
+msgstr ""
+"check50 không thể sử dụng bằng chế độ tương tác, có thể "
+"không hoạt động như mong đợi."
+```
+
+Instead of:
+```
+msgstr ""
+"check50 không thể sử dụng bằng chế độ tương tác, có thể không hoạt động như mong đợi."
+```
+
+
+## Translation Error Reports
+
+
+## References
+This document was adapted from the open-source contribution guidelines for [Meta's Draft](https://github.com/facebookarchive/draft-js/blob/main/CONTRIBUTING.md)