* Add pull requests guide doc
Co-Authored-By: NRyan Lucia <ryan@luciaonline.net>
Co-authored-by: NRyan Lucia <ryan@luciaonline.net>
Co-authored-by: NDan Moseley <danmose@microsoft.com>

* Add up for grabs links to coreFX and coreCLR

Add note under Up for grabs about issues in CoreCLR and CoreFX, until Issues are fully consolidated. 
and to submit pull requests to the Runtime Repo. 
Contributes to #304

* Update CONTRIBUTING.md
Co-authored-by: NDan Moseley <danmose@microsoft.com>

* Move files into hierarchy

* fix more links

* Fix botr and features links

* Remove bad apostrophe

* spelling

* Apply suggestions from code review
Co-Authored-By: NYoussef Victor <31348972+Youssef1313@users.noreply.github.com>

* Update docs/coding-guidelines/package-projects.md
Co-Authored-By: NJan Kotas <jkotas@microsoft.com>
Co-authored-by: NYoussef Victor <31348972+Youssef1313@users.noreply.github.com>
Co-authored-by: NJan Kotas <jkotas@microsoft.com>

* Update Contributing.MD link for misspelled link

Updated link docs/project/api-review-process.md so 404 error will be corrected.

* update Contributing.MD links

updated coreclr to run time for remainder of links.

There were some broken links in the contributing docs, probably caused
by the repo consolidation.

The link of api-review-process.md in the doc should be updated.

Fix #443

* Consolidate sub-repo docs