Add installer

* start

* Add tests

* Clean up changes

* Update tool-cache we consume

* Use custom 7zr

docs/contributors.md

@@ -0,0 +1,17 @@
+# Contributors
+
+
+# Checkin
+
+- Do checkin source (src)
+- Do checkin build output (lib)
+- Do checkin runtime node_modules
+- Do not checkin 
+
+# Adding a dev dependency
+
+Remember to update .gitignore.  
+
+# Updating toolkit dependency
+
+Until released publically, update tgz packages in toolkit