add documentation issue template

.github/ISSUE_TEMPLATE/documentation.md

@@ -0,0 +1,29 @@
+---
+name: Documentation improvement
+about: Create a report to help us improve the documentation
+labels: doc
+---
+
+<!--To help us understand and resolve your issue, please fill out the form to the best of your ability.-->
+<!--You can feel free to delete the sections that do not apply.-->
+
+### Problem
+
+<!--
+If you are referencing an existing piece of documentation or example please provide a link.
+
+* I found [...] to be unclear because [...]
+* [...] made me think that [...] when really it should be [...]
+* There is no example showing how to do [...]
+-->
+
+
+### Suggested Improvement
+
+<!--
+If you have an idea to improve the documentation please suggest it here
+
+* This line should be be changed to say [...]
+* Include a paragraph explaining [...]
+* Add a figure showing [...]
+-->