adding a script to install VPP apps (#865)

tools/api/commands/install_vpp_application

@@ -0,0 +1,17 @@
+#!/bin/bash  
+# Install VPP application on device
+# VPP app needs to be registered with the device serial number using the apple endpoint (https://vpp.itunes.apple.com/mdm/v2/assets/associate)  before one can install it on a device
+source $MICROMDM_ENV_PATH
+endpoint="v1/commands"
+jq -n \
+  --arg request_type "InstallApplication" \
+  --arg udid "$1" \
+  --arg itunes_store_id $2 \
+  '.udid = $udid
+  |.request_type = $request_type
+  |.itunes_store_id = ($itunes_store_id|tonumber)
+  |.options = {"purchase_method": 1}
+  '|\
+  curl $CURL_OPTS \
+    -H "Content-Type: application/json" \
+    -K <(cat <<< "-u micromdm:$API_TOKEN") "$SERVER_URL/$endpoint" -d@-