feat: add docs to rate a hostea doctor

docs/gitea-clinic-rate-doctor.md

@@ -0,0 +1,33 @@
+# Add ratings to Hostea Doctor
+
+1. To rate Doctor `batman` from
+   [./gitea-clinic-new-doctor.md](./gitea-clinic-new-doctor.md) guide,
+   add the following section to `batman` section:
+
+```toml
+[[ doctors.reviews ]]
+name = "Joker Hahaha"
+rating = 0
+remarks = "Hahaha"
+```
+
+**Note: Only add reviews between doctor-specific section delimited by
+comment format mentioned in style guide**
+
+The end result must look like the following:
+
+```toml
+## ------------- batman ---------
+[[ doctors ]]
+nick = "batman"
+name ="Bruce Wayne"
+photo = "static/people/batman.jpg"
+website = "https://bat.example.com"
+
+[[ doctors.reviews ]]
+name = "Joker Hahaha"
+rating = 0
+remarks = "Hahaha"
+
+## ------------- start batman ---------
+```