Update run-addon and README for WSL. (mozilla-services#4289)

README.md

@@ -46,7 +46,12 @@ The server will automatically setup the tables in your database, and keep them u
 
 If you have growl and growlnotify installed on Mac OS X, you will get growl notifications when the server build has started and completed.
 
-We apologize but we have no story for development on Windows (though the add-on runs on Windows).  [We welcome feedback](https://github.com/mozilla-services/screenshots/issues/4289).
+#### Development on Windows
+
+It is possible to develop on Windows 10 with Windows Subsystem for Linux (WSL).  Windows 10 build 17046 or newer is required.  Do the following once you've installed WSL and a Linux distro:
+
+- Create a symlink to Nightly on Windows; ensure this is on your $PATH.  (E.g. `/home/moz/bin/firefox -> '/mnt/c/Program Files/Nightly/firefox.exe'`)
+- Clone the project to the Windows filesystem.  (E.g. `/mnt/c/projects/screenshots`, _not_ `/home/moz/projects/screenshots`)
 
 ### Linting and Testing
 

bin/run-addon

@@ -99,6 +99,9 @@ fi
 
 if [[ -n "$setup_profile" ]] ; then
   profile_dir="$(pwd)/Profile"
+  if [[ "$(uname -r)" =~ "Microsoft" ]] ; then
+    profile_dir="$(wslpath -w $profile_dir)"
+  fi
   if [[ -d "$profile_dir" ]] ; then
     echo "Using existing profile in $profile_dir running:"
     echo " " "${open[@]}" -n --args -new-instance -no-remote -profile "$profile_dir"