docs: move api to new file

docs/psa_api.md

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+# PSACC API
+1. Get the car state
+    
+   http://localhost:5000/get_vehicleinfo/YOURVIN
+
+2. Get the car state from cache to avoid to use PSA API too much
+
+   http://localhost:5000/get_vehicleinfo/YOURVIN?from_cache=1
+
+3. Stop charge
+
+   http://localhost:5000/charge_now/YOURVIN/0
+
+4. Set hour to stop the charge to 6 am
+
+   http://localhost:5000/charge_control?vin=YOURVIN&hour=6&minute=0 
+
+5. Change car charge threshold to 80%
+
+   http://localhost:5000/charge_control?vin=YOURVIN&percentage=80 
+
+6. See the dashboard (only if record is enabled)
+
+   http://localhost:5000
+
+7. Refresh car state (ask car to send its state):
+
+   http://localhost:5000/wakeup/YOURVIN
+
+8. Start (1)/Stop (0) preconditioning
+
+   http://localhost:5000/preconditioning/YOURVIN/1 or 0
+
+9. Change charge hour (for example: set it to 22h30)
+
+   http://localhost:5000/charge_hour?vin=YOURVIN&hour=22&minute=30
+
+10. Honk the horn
+
+    http://localhost:5000/horn/YOURVIN/count
+
+11. Flash the lights (Duration is always roughly 10 seconds, regardless of set duration)
+
+   http://localhost:5000/lights/YOURVIN/duration
+
+12. Lock (1)/Unlock (0) the doors
+   
+   http://localhost:5000/lock_door/YOURVIN/1 or 0