Create a directory for specifications

Author: barchetta

docs-internal/README.md

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+
+# Internal Documents and Specifications
+
+This directory contains internal documents and specifications. These 
+fall into a number of categories:
+
+* Guidelines and best practices
+* Design documents
+* Feature proposals
+* Or pretty much anything else
+
+By keeping our documents as source code we can easily find them and easily review them.
+
+# Specs vs GitHub Issues
+
+In many cases GitHub issues are sufficient for tracking requirements and basic
+proposals. But a spec might be more appropriate if you want an easy to review,
+living document with a fair amount of detail.
+
+# Use Markdown
+
+Write your specs in Markdown. AsciiDoc is also OK if you need it.
+