added a contributing guide

README.md

@@ -2,7 +2,8 @@
 This is list of discounts on software (SaaS, PaaS, IaaS, etc.) and other offerings for developers who happen to be students.
 This list is greatly inspired by the [free-for-dev list](https://github.com/ripienaar/free-for-dev)
 
-You can help by sending Pull Requests to add more services. Once I have a good set of links in this README file, I'll look into a better layout for the information and links (help with that is appreciated too).
+You can help by sending Pull Requests to add more services. Please great the [contribution guidelines](contributing.md) first.
+Once I have a good set of links in this README file, I'll look into a better layout for the information and links (help with that is appreciated too).
 
 If you're not inclined to make PRs you can tweet me at [@acho_arnold](https://twitter.com/acho_arnold)
 
@@ -102,11 +103,6 @@ Table of Contents
 
   * [Microsoft DreamSpark](https://www.dreamspark.com/Student/Default.aspx) - DreamSpark is a Microsoft Program that supports technical education by providing access to Microsoft software for learning, teaching and research purposes.
 
-
-# Contribute
-
-Contributions welcome! Read the contribution guidelines first.
-
 # License
 
 [![CC0](http://i.creativecommons.org/p/zero/1.0/88x31.png)](http://creativecommons.org/publicdomain/zero/1.0/)

contributing.md

@@ -0,0 +1,17 @@
+# Contribution Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search previous offerings before making a new one, as yours may be a duplicate.
+- Make an individual pull request for each offering.
+- Use the following format: `[Title](link) - Description.`
+    - The title usually consists of several words. For bookmarks of an article or tutorial, use the title of the article.
+    - The description consists of one-two sentences about the bookmark. It is required.
+- Titles should be [capitalized](http://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html).
+- Additions should be added to the bottom of the relevant category.
+- New categories or improvements to the existing categorization are welcome.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+- The pull request and commit should have a useful title.
+
+Looking forward to your contributions!