Create 4.2. op request=booking_update

4.2.-op-request=booking_update.md

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+### request=booking_update
+
+**request** PUSH start, pause, cancel and end bike rental is implemented via this update request. Prerequisite is the reservation via the initial "request=booking_request".
+
+The following booking states are implemented:
+`state=canceled` booking request will be canceled. The bike is set to `state=available` in the COPRI backend.
+`state=occupied` bike rental starts.
+`state=available` end the bike rental, which makes the bike `state=available` again in the COPRI backend.
+
+The following lock states are implemented:
+`lock_state=unlocked` successfully unlocking the lock.
+`lock_state=locking` end rent signal, smartlock was triggered to close. 
+`lock_state=locked` closed successfully.
+
+| key    | Required    | Format   | Comment                        |
+| ------------ | ----------- | -------- | ------------------------------ |
+| authcookie   | +           | text | unique encrypted key                                  |
+| bike         | +           | text  | bike prefix+number                                           |
+| state        | +           | text     | one of the bike states: canceled, occupied, available |
+| lock_state   | o/+ | text     | one of the lock states: locked, locking, unlocked    |
+| latitude          | +  | text    | App GPS only necessary on state=available |
+| longitude          | +  | text    | App GPS only necessary on state=available |
+| gps_age      | o/+  | text     | App GPS age only necessary on state=available. value in milliseconds. |
+| gps_accuracy | o  | text     | App GPS accuracy on state=available in meters |                                  |
+| firmware     | o | text     | Firmware Version                                      |
+| Ilockit_GUID | o | text | example: 00000000-0000-0000-e57e6b9aee16              |
+
+
+**response** returns also **request=user_bikes_occupied** with `bikes_occupied` JSON-Objects
+
+Example
+**request**  starts bike rental and unlock smartlock at once. lock_state=unlocked can also be done on second request.
+```
+https://shareeapp-fr01.copri-bike.de/APIjsonserver?request=booking_update&bike=FR1540&state=occupied&lock_state=unlocked&authcookie=6103_7dc3c95028d06c9663378f6d44346de7_12345678
+```
+
+**response** sharee JSON defaults + **response** rental state with `user_bikes_occupied` JSON-objects
+```
+{
+   "shareejson" : {
+    ***sharee JSON defaults***
+    },
+      "bikes_occupied" : {
+         "155896" : {
+            "start_time" : "2021-10-28 18:09:17.454818+02",
+            "unit_price" : "2.00",
+            "description" : "Vauban-bike (Ilockit)",
+            "lock_state" : "unlocked",
+            "request_time" : "2021-10-28 17:56:07.541766+02",
+            "K_u" : "[-26, 6, -7, -80, 82, -71, -117, 57, 24, -91, 32, -44, 80, -112, 32, -66, -51, -106, 100, -99, 0, 0, 0, 0]",
+            "K_seed" : "[122, -30, 85, -21, -47, 71, 54, 25, -60, -53, 78, 49, -74, 84, 72, 63]",
+            "bike_group" : [
+               "FR300001"
+            ],
+            "uri_operator" : "https://shareeapp-fr01.copri-bike.de",
+            "real_hours" : "0",
+            "system" : "Ilockit",
+            "computed_hours" : "0",
+            "gps" : {
+               "longitude" : "7.825490",
+               "latitude" : "47.976634"
+            },
+            "tariff_description" : {
+               "max_eur_per_day" : "15.00",
+               "eur_per_hour" : "2.00",
+               "name" : "Vauban Bonus",
+               "number" : "5504",
+               "free_hours" : "1.00"
+            },
+            "state" : "occupied",
+            "bike" : "FR1540",
+            "total_price" : "0.00",
+            "station" : "FR101",
+            "Ilockit_GUID" : "00000000-0000-0000-0000-fc3c002a2add",
+            "Ilockit_ID" : "ISHAREIT-2200540",
+            "end_time" : "2021-10-28 18:09:19"
+         }
+      },
+   "155899" : {
+           ...
+        }
+}
+```