Add initial docs

docs/api/auth.md

@@ -0,0 +1,55 @@
+## POST /api/v1/register
+### Body:
+```json
+{
+    "username": "string",
+    "password": "string",
+    "email": "string"
+}
+```
+
+Registers a new user
+
+### Returns (success):
+```json
+{
+    "username": "string",
+    "registerDate": 0
+}
+```
+
+### Returns (error):
+```json
+{
+    "error": "user already exists"
+}
+```
+
+---
+
+## POST /api/v1/login
+### Body:
+```json
+{
+    "username": "string",
+    "password": "string"
+}
+```
+
+Logs in a user and returns a new session
+
+### Returns (success):
+```json
+{
+    "owner": "string",
+    "token": "string"
+}
+```
+
+### Returns (incorrect credentials):
+```json
+{
+    "owner": "string",
+    "error": "incorrect credentials"
+}
+```