License: GPL-3.0

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project does not adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 - Improved styling using card layout
+- Changed licence to GPL-3.0 in order to allow commercial use and advertisement.
 
 ## [0.1.3] - 2017-03-24
 ### Changed

CONTRIBUTING.md

@@ -0,0 +1,12 @@
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+See the following guide on how to create a fork and a pull request: 
+https://help.github.com/articles/fork-a-repo/
+
+
+## Priciples in this project:
+ * *less code, less bugs:* use fewer lines if possible, remove abstractions that are not required. 
+ * *minimal features and complexity:* only implement features that are really necessary for most users 
+ * *batteries included/No build process:* the user should only download the repo and update the config file in order to run the app.   
+ * *no database:* the application does not have it's own database. The IMAP server is the database. 
+