Add README file.

README.md

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+# yesod-cookbook
+
+This repository houses snippets, techniques for solving practical
+problems with Yesod.
+
+You can view the pages here:
+* [Cookbook](https://github.com/yesodweb/yesod-cookbook/blob/master/Cookbook.md)
+* [Snippets](https://github.com/yesodweb/yesod-cookbook/blob/master/Snippets.md)
+
+
+## How to contribute?
+
+### Creating a new Cookbook page
+
+All the pages related to cookbook are inside the directory
+`cookbook-pages`. Create a new file inside it and add a corresponding
+link for it in the
+[Cookbook section](https://github.com/yesodweb/yesod-cookbook/blob/master/Cookbook.md)
+
+### Creating a new Snippet page
+
+All the pages related to cookbook are inside the directory
+`snippets`. Create a new file inside it and add a corresponding
+link for it in the
+[Snippets section](https://github.com/yesodweb/yesod-cookbook/blob/master/Snippets.md)