Update readme

README.md

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 # service-authentication
+
+This is a service that provides authentication for the other services in the system.
+
+### Features:
+
+- Registration
+- Login
+- Password Reset
+- Webhooks
+- JWTs
+  - Token Refresh
+- oAuth
+  - Configurable token providers
+  - Linking oAuth to user profile
+- MFA
+  - SMS-based, OTPs
+  - Authenticator apps
+- Rate limiting
+- CAPTCHA
+- Audit trail
+- Roles and caps
+
+---
+
+## Reference
+
+## Endpoints
+
+### POST /register
+
+Register a new user.
+
+#### Request
+
+```json
+{
+  "email": "example@gmail.com", // required
+  "password": "password123" // optional, if not provided, a random password will be generated
+}
+```