Add CONTRIBUTE and INSTALL file

CONTRIBUTE.md

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+Awesome! You want to help us! It is also necessary for us to get help from our community. So we prepared this file to
+give you a short introduction!
+
+# Report a bug
+1. Check if the issue has already been reported.
+2. Try to isolate the problem.
+3. Report your issue using the template below.
+
+    ## Summary
+    Describe your problem.
+
+    ## Information
+    Readium Version: e.g. 1.2.1
+    Browser: e.g. Chrome 30
+    OS: e.g. OSX
+
+# Implement features
+You can also implement great features and send a pull request instead. Follow the steps in the file `INSTALL.md` to get
+`readium` work.

INSTALL.md

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+# Get it work
+To get the dev environment working you simply need to run `make`. Once, this is done you can access our `grunt` commands:
+
+- collect
+- listen
+- build