Updating installation instructions for v0.6.0-rc1 (#328)
Updating installation instructions for v0.6.0-rc1 (#328)

* Updated Xcode project setup instructions.

These modifications are based on the suggestions by Dave Fernandes here: https://groups.google.com/a/tensorflow.org/d/msg/swift/YntTUh6E20Q/LchmSQhIBAAJ

* Staging 0.6-rc1 release.

* Adding CUDA 10.1 binary for 0.6 release.

* Minor organizational tweak.

* Minor organizational tweak 2.

* Update Installation.md

Co-Authored-By: Dan Zheng <e8b2cf6f3981c18438c47df51a789b3589ac132d@google.com>

tensorflow/swift,tensorflow/swift