Add tensorflow forum for community engagements

Add TensorFlow Forum for TF community engagement to discuss TF build and install issues.

Author: ymodak

site/en/install/errors.md

@@ -1,7 +1,8 @@
 # Build and install error messages
 
-TensorFlow uses [GitHub issues](https://github.com/tensorflow/tensorflow/issues){:.external}
-and [Stack Overflow](https://stackoverflow.com/questions/tagged/tensorflow){:.external}
+TensorFlow uses [GitHub issues](https://github.com/tensorflow/tensorflow/issues){:.external},
+[Stack Overflow](https://stackoverflow.com/questions/tagged/tensorflow){:.external} and
+[TensorFlow Forum](https://discuss.tensorflow.org/c/general-discussion/6){:.external}
 to track and document build and installation problems.
 
 The following list links error messages to a solution or discussion. If you find