Create add-documentation.md

Author: tstreamDOTh

.github/ISSUE_TEMPLATE/add-documentation.md

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+---
+name: Add Documentation
+about: Add documentation for an algorithm
+
+---
+
+Please search if an issue has already be placed before adding another issue.
+
+If you want to add an algorithm to the repository. 
+Please include the following in the issue.
+
+## Title: 
+Documentation of Algorithm 
+
+## Issue: 
+Corresponding Issue number 
+
+Are you working on this? - **Yes/No**
+(**If you are going to work on the issue yourself, make sure you comment on the issue to let others know.**
+We do not want multiple people to be working in the same issue without notice.)