doc: add doc for administration and development

Author: SharzyL

README.md

@@ -77,3 +77,31 @@ $ curl -u admin1:this-is-passwd-1 -Fc=@/path/to/file example-pb.com
   "isPrivate": false
 }
 ```
+
+## Administration
+Delete a paste:
+```console
+$ yarn delete-paste <name-of-paste>
+```
+
+List pastes:
+```console
+$ yarn wrangler kv:key list --binding PB > kv_list.json
+```
+
+## Development
+
+Run a local simulator:
+```console
+$ yarn dev
+```
+
+Run tests:
+```console
+$ yarn test
+```
+
+Run tests with coverage report:
+```console
+$ yarn coverage
+```