docs: update readme

README.md

@@ -1,3 +1,21 @@
+## Getting Started Developing
+
+Run their shell script (note: as yourself, not root)
+
+```
+curl -fsSL https://deno.land/install.sh | sh
+```
+
+Using Nix:
+
+```
+nix-shell -p deno
+```
+
+`deno run task serve`
+
+navigate to http://localhost:8000
+
 ## TODO
 
 - [x] sign up