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+# Contributing Guide to PostCSS
+
+If you want contribute to PostCSS, there are few things that you should
+be familiar with.
+
+
+## In Case You Have Question About Using PostCSS
+
+* **Ask for help in [the chat]**
+
+    If you stuck on something there is a big chance
+    that someone had similar problem before.
+
+[the chat]: https://gitter.im/postcss/postcss
+
+
+## Adding Your Plugin to the List
+
+If you created or found a plugin and want to add it to PostCSS plugins list
+follow this simple steps.
+
+PR should not change plugins defined in README it contains only favorite plugins
+and moderated by PostCSS author.
+
+Plugins submitted by community located in [`docs/plugins`].
+
+* **Keep plugins order**
+
+    Be sure that plugin not presented yet and find suitable position
+    in alphabetic order for it.
+    But plugins with `postcss-` prefix should come first.
+
+* **Check spelling**
+
+    Before submitting PR be sure that spelling check pass.
+    For that run command `npm test`.
+    If it fails with unknown word error, add it as word
+    to `.yaspellerrc` dictionary.
+
+* **Check PostCSS plugin guideline**
+
+    Provided plugin should match plugin [guidelines].
+
+- **Provide link to suggested plugin**
+
+    Make sure your pull request description contains link to plugin
+    you are willing to add.
+
+[`docs/plugins`]: https://github.com/postcss/postcss/blob/master/docs/plugins.md
+[guidelines]:     https://github.com/postcss/postcss/blob/master/docs/guidelines/plugin.md
+
+
+## TypeScript Declaration Improvements
+
+If you found a bug or want to add certain improvements to types declaration file
+
+* **Check current TypeScript styling**
+
+   Be sure that your changes match TypeScript styling rules defined in typings file.
+    * We use classes for existing JS classes like `Stringifier`.
+    * Namespaces used for separating functions related to same subject.
+    * Interfaces used for defining custom types.
+
+   Make sure you read through declaration file writing [best practices]
+   by TypeScript team.
+
+[best practices]: https://www.typescriptlang.org/docs/handbook/declaration-files/do-s-and-don-ts.html
+
+
+## Core Development
+
+If you want to add new feature or fix existed issue
+
+- **Become familiar with PostCSS architecture**
+
+    For gentle intro to PostCSS architecture look through our [guide].
+
+[guide]: https://github.com/postcss/postcss/blob/master/docs/architecture.md