Improve documentation.

CONTRIBUTING.txt

@@ -19,6 +19,8 @@ frustration later on.
 ### Code reviews
 All submissions, including submissions by project members, require review.
 
+Information on how to sumbit changes for review is provided in README.md.
+
 ### The small print
 Contributions made by corporations are covered by a different agreement than
 the one above, the

README.md

@@ -16,20 +16,23 @@ On Windows, most applications can be made to use SwiftShader's DLLs by placing t
 Contributing
 -----------------
 
-See CONTRIBUTING.txt for important contributing requirements.
+See [CONTRIBUTING.txt](CONTRIBUTING.txt) for important contributing requirements.
 
-The canonical repository for SwiftShader is hosted at
+The canonical repository for SwiftShader is hosted at:
 https://swiftshader.googlesource.com/SwiftShader
 
-All changes must be reviewed and approved in the Gerrit review tool at
+All changes must be reviewed and approved in the [Gerrit](https://www.gerritcodereview.com/) review tool at:
 https://swiftshader-review.googlesource.com
 
-All changes require a Change-ID tag in the commit message. A commit hook may be used to add this tag automatically, and can be found at:
+Authenticate your account here:
+https://swiftshader-review.googlesource.com/new-password
+
+All changes require a [Change-ID](https://gerrit-review.googlesource.com/Documentation/user-changeid.html) tag in the commit message. A commit hook may be used to add this tag automatically, and can be found at:
 https://gerrit-review.googlesource.com/tools/hooks/commit-msg. To clone the repository and install the commit hook in one go: 
 
     git clone https://swiftshader.googlesource.com/SwiftShader && (cd SwiftShader && curl -Lo `git rev-parse --git-dir`/hooks/commit-msg https://gerrit-review.googlesource.com/tools/hooks/commit-msg ; chmod +x `git rev-parse --git-dir`/hooks/commit-msg)
 
-Changes are uploaded to Gerrit by performing
+Changes are uploaded to Gerrit by performing:
 
     git push origin HEAD:refs/for/master
 
@@ -43,21 +46,21 @@ Contact
 
 Public mailing list: swiftshader@googlegroups.com
 
-Bug tracker: bugs.chromium.org/p/swiftshader
+Bug tracker: https://bugs.chromium.org/p/swiftshader
 
 License
 ----------
 
-The SwiftShader project is licensed under the Apache License Version 2.0. You can find a copy of it in LICENSE.txt.
+The SwiftShader project is licensed under the Apache License Version 2.0. You can find a copy of it in [LICENSE.txt](LICENSE.txt).
 
 Files in the third_party folder are subject to their respective license.
 
 Authors and Contributors
 -----------------------------------
 
-The legal authors for copyright purposes are listed in AUTHORS.txt.
+The legal authors for copyright purposes are listed in [AUTHORS.txt](AUTHORS.txt).
 
-CONTRIBUTORS.txt contains a list of names of individuals who have contributed to SwiftShader. If you're not on the list, but you've signed the Google CLA and have contributed more than a formatting change, feel free to request to be added.
+[CONTRIBUTORS.txt](CONTRIBUTORS.txt) contains a list of names of individuals who have contributed to SwiftShader. If you're not on the list, but you've signed the [Google CLA](https://cla.developers.google.com/clas) and have contributed more than a formatting change, feel free to request to be added.
 
 Disclaimer
 ---------------