Add README and plugin description

kostal/README.md

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+# KOSTAL Solar Electric
+
+Connects to a KOSTAL Solar Electric inverter.
+
+In order to communicate with your inverter it is necessary to open the `Modbus TCP` interface on your inverter. Please check the manual of your inverter for instructions.
+
+## Supported things
+
+* Kostal Inverters
+* Kostal Meters
+* Connected batteries
+
+## More
+
+https://www.kostal-solar-electric.com
+

kostal/meta.json

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+{
+    "title": "KOSTAL Solar Electric",
+    "tagline": "Connect to Kostal Solar Electric inverters.",
+    "icon": "kostal.png",
+    "stability": "consumer",
+    "offline": true,
+    "technologies": [
+        "network"
+    ],
+    "categories": [
+        "energy"
+    ]
+}