Add plugin get ac power adapter wattage. (#1385)

* add power wattage plugin

* update image

System/power_wattage.30s.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+#
+# <bitbar.title>Power Wattage</bitbar.title>
+# <bitbar.version>v1.0</bitbar.version>
+# <bitbar.author>vxider</bitbar.author>
+# <bitbar.author.github>vxider</bitbar.author.github>
+# <bitbar.desc>The AC power adapter wattage for macos</bitbar.desc>
+# <bitbar.image>https://i.imgur.com/4N0xk1g.jpg</bitbar.image>
+# <bitbar.dependencies></bitbar.dependencies>
+# <bitbar.abouturl></bitbar.abouturl>
+
+power_wattage="$(/usr/sbin/system_profiler SPPowerDataType | grep "Wattage (W)" | awk "{print \$3\"W\"}")"
+
+if [ -z "$power_wattage" ]
+then
+  echo "🔋" 
+else
+  echo "🔌${power_wattage}"
+fi
+
+echo "---"
+echo "Refresh... | refresh=true"