Add documentation for hosting CDN content on a dev environment.

README.md

@@ -40,3 +40,30 @@ Note that `bcrypt_elixir` will require a working compiler in the PATH. On a Wind
 ## Log into Cockroachdb sql shell
 
 `./cockroach sql --database="uro_dev" --insecure`
+
+You may approve all pending email verifications using:
+
+```
+update users set email_confirmation_token=null, email_confirmed_at=NOW() where true;
+```
+
+And you can grant upload privileges for all users using
+```
+update user_privilege_rulesets set can_upload_avatars=true, can_upload_maps=true, can_upload_props=true where true;
+```
+
+Finally, to enable admin access for a specific user id:
+```
+update user_privilege_rulesets set is_admin=true where user_id = '12345678-abcd-...';
+```
+
+## Host local CDN for testing
+
+By default, the `dev` environment will store assets in `priv/waffle/private` directory, and the client expects this to be available on port 80. To serve the CDN content on port 80:
+
+```
+cd priv/waffle/private
+python -m http.server 80
+```
+
+Windows allows any user to serve port 80 by default, but on other operating systems the above should be run with sudo.