add contribution guidelines

CONTRIBUTING.md

@@ -0,0 +1,14 @@
+# Contribution Guidelines
+
+To start a discussion, simply create an issue.
+
+You can add links through pull requests, ensure your pull request adheres to the following guidelines:
+
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Make an individual pull request for each suggestion.
+- Use the following format:
+ - for GitHub repos : `[author/reponame](link) - Description.` `.
+ - for websites : `[Website](link) [language] - Description.` `[language]` is optional if english.
+ - for articles : `[Author](link) [language] - (publication year) Description.` `[language]` is optional if english.
+- Keep link descriptions short and simple, but descriptive.
+- Check your spelling and grammar.

README.md

@@ -4,7 +4,7 @@
 - I spend a lot of time on internet, losing myself in lot of topics. I choose GitHub to list my findings and bookmarks in a central location for productivity, to avoid losing my findings, and also to share them with the world.
 - :warning: [**Full version**](https://github.com/MorganGeek/bookmarks/blob/master/README.md) :warning: I advise you to consult this very same page [here](https://github.com/MorganGeek/bookmarks/blob/master/README.md) for full content, as [GitHub truncates files with a size over 500KB on main page](https://twitter.com/MorganGeek/status/976936079025737729), causing incomplete display of this list.
 
-Contributions are more than welcome. Add links through pull requests or create an issue to start a discussion.
+Contributions are more than welcome. Read the [contribution guidelines](CONTRIBUTING.md).
 
 by **[@MorganGeek](https://twitter.com/MorganGeek)**