Create DevelopmentGuidelines.md (#2733)

To partially replace file with '&' in name.

Author: nataled

docs/DevelopmentGuidelines.md

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+---
+layout: doc
+title: Ontology Development Guidelines
+---
+
+### Releases
+
+    * Keep your edit file (the file you change on a regular basis) and your release files strictly separate
+    * Imports should be merged into the main release file
+
+### Collaboration
+
+    * Tag your GitHub repository with the obofoundry tag so that people can find it: https://github.com/topics/obofoundry
+
+