Add initial notes to README

Author: eaftan

README.md

@@ -1,2 +1,31 @@
-# copilot-workspace-user-manual
-The user manual for Copilot Workspace
+# Copilot Workspace User Manual
+
+Welcome!  This is the user manual for Copilot Workspace.
+
+TODO(eaftan): Insert backlink to landing page with more info about CW
+
+## Conceptual overview
+
+* Enable the user to collaborate with AI. Not fully autonomous.
+* Key principles are __transparency__ and __steerability__
+* ...
+
+TODO(eaftan): Document the following:
+
+* Tip to check the file selection if you're not happy with the result, and how to steer it
+* How to adjust file selection by mentioning file names, directory names, etc. in the issue/task panel
+* Paste in relevant documentation into the issue panel, it won't sync back to the issue
+* Regen advice
+* Experiments panel
+* Implement one file at a time
+* Sessions and link sharing, guest access
+* Your work is auto saved
+* What to do if your issue and repo are different
+* Advice about editing the issue in CW vs. editing the actual issue
+* Work around file size constraints by generating a new file and copying and pasting in
+* continue further iteration in a new CW session
+* devcontainer.json and its interaction with the terminal
+* file syncing between the terminal/codespace and CW web UI
+* how to report issues/give feedback
+* how to report responsible AI issues
+* mention that undo/redo is supported