adding Troubleshooting guide to docs

docs/dci-troubleshooting.md

@@ -0,0 +1,8 @@
+# Data Controller for SAS® - Troubleshooting
+
+## Overview
+[Let us know](https://datacontroller.io/contact/) if you experience an installation problem that is not described here!
+
+## Internet Explorer - blank screen
+If you have an older, or 'locked down' version of Internet Explorer you may get a blank / white screen when navigating to the Data Controller url.  To fix this, click settings (cog icon in top right), *Compatibility View settings*, then **uncheck** *Display intranet sites in Compatibility view* as follows:
+![menu](img/dci-trouble1.png)

mkdocs.yml

@@ -11,6 +11,7 @@ pages:
 - Installing Data Controller:
     - Backend: dci-backend.md
     - Frontend: dci-frontend.md
+    - Troubleshooting: dci-troubleshooting.md
 
 markdown_extensions:
   - admonition