Add Style Guidelines (#319)

* update README.md

* add a minimal style guide

* format backtick properly

* minor tweaks

* make "words as words" clearer

README.md

@@ -1,8 +1,25 @@
-Best viewed on the website: https://docs.ankiweb.net
+# Anki Manual
 
-This manual is licensed under the CC BY-SA 4 license:
+This repository contains the source of [Anki's user manual](https://docs.ankiweb.net).
 
-https://creativecommons.org/licenses/by-sa/4.0/
+## License 
 
-Pull requests are welcome. Unless you state otherwise, any pull requests you
-submit will be licensed under the above license. Please see [CONTRIBUTING](CONTRIBUTING.md) for more details.
+This manual is licensed under the [CC BY-SA 4 license](https://creativecommons.org/licenses/by-sa/4.0/).
+
+## Contributing
+
+Contributions are welcome! Please see the [issue tracker](https://github.com/ankitects/anki-manual/issues) for things you can start working on. For details on local development, see [CONTRIBUTING](CONTRIBUTING.md).
+
+Unless stated otherwise, any pull requests you
+submit will be licensed under the [CC BY-SA 4 license](https://creativecommons.org/licenses/by-sa/).
+
+## Style Guidelines
+
+The following conventions are not consistently applied in the manual. If you find such text, feel free to change it.
+
+- Use double quotes, `"`, instead of single quotes, `'`.
+- For emphasis such as when defining a word, use italics, `_`.
+- Also use italics when referring to a word itself rather than what it means, e.g. "To search for either _dog_ or _cat_, use `dog or cat`".
+- When referring to UI elements, use bold formatting, `**`.
+- When referring to keyboard buttons, wrap them with `<kbd></kbd>`.
+- Use code formatting for example inputs by wrapping them with backticks, `` ` ``.