feat(docs): api

Author: krystxf

docs/src/pages/docs/_meta.json

@@ -3,6 +3,7 @@
     "---": {
         "type": "separator"
     },
+    "api": "Api",
     "backend": "Backend",
     "legal": "Legal"
 }

docs/src/pages/docs/api.mdx

@@ -0,0 +1,17 @@
+# V1
+
+## Metro departures
+
+[Original data source](https://api.golemio.cz/pid/docs/openapi/#/%F0%9F%9A%8F%20PID%20Departure%20Boards/get_pid_departureboards)
+
+Metro departures from platforms (GTFS ID)
+
+### Endpoint
+
+`/v1/metro/departures`
+
+### Parameters
+
+-   **Platform ID** (required)
+    -   One platform (e.g. `gtfsID=U1040Z101P`)
+    -   Multiple platforms (e.g. `gtfsID=U1040Z101P&gtfsID=U1040Z102P`)