Merge pull request #236 from thussaiththelaw/main

Adding AHT21 Temperature/Humidity Sensor

Author: tyeth

components/i2c/aht21/definition.json

@@ -0,0 +1,7 @@
+{
+    "vendor": "ASAIR",
+    "documentationURL": "http://www.aosong.com/en/products-60.html",
+    "displayName": "aht21",
+    "i2cAddresses": [ "0x38"],
+    "subcomponents": [ "ambient-temp", "ambient-temp-fahrenheit", "humidity"]
+}