Add experimental status note (#70)

Author: austinvalle

README.md

@@ -49,3 +49,7 @@ go run ./cmd/tfplugingen-openapi generate \
 ## License
 
 Refer to [Mozilla Public License v2.0](./LICENSE).
+
+## Experimental Status
+
+By using the software in this repository (the "Software"), you acknowledge that: (1) the Software is still in development, may change, and has not been released as a commercial product by HashiCorp and is not currently supported in any way by HashiCorp; (2) the Software is provided on an "as-is" basis, and may include bugs, errors, or other issues; (3) the Software is NOT INTENDED FOR PRODUCTION USE, use of the Software may result in unexpected results, loss of data, or other unexpected results, and HashiCorp disclaims any and all liability resulting from use of the Software; and (4) HashiCorp reserves all rights to make all decisions about the features, functionality and commercial release (or non-release) of the Software, at any time and without any obligation or liability whatsoever.