docs: you can add another git remote

docs/contributing.md

@@ -4,9 +4,17 @@
 
 - Clone your repository
 
-Alternatively, you can change the `origin` remote on your existing clone:
+  1. Alternatively, you can add a remote called `fork`:
 
-`git remote set-url origin https://dev.tildefriends.net/YOUR_USERNAME/tildefriends.git`
+  `git remote add fork https://dev.tildefriends.net/YOUR_USERNAME/tildefriends.git`
+
+  You'll need to set your branch's upstream to `fork`:
+
+  `git push --set-upstream fork my-branch`
+
+  2. or you can change the `origin` remote on your existing clone altogether:
+
+  `git remote set-url origin https://dev.tildefriends.net/YOUR_USERNAME/tildefriends.git`
 
 - Make your changes