* Made small changes in punctuation, word selection, and word order to make it easier to read and understand the README and CONTRIBUTING 'md' files.

* Made changes based on feedback from @daniel-beck.

* Update README.md

Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Update CONTRIBUTING.md

Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>

* Apply suggestions from code review

Co-authored-by: Burk Hufnagel <304328+BurkHufnagel@example.com>
Co-authored-by: Oleg Nenashev <o.v.nenashev@gmail.com>
Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>
Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>

* Draft the new maintainer guide

* Maintainer guide - Apply suggestions from code review

Co-Authored-By: Raihaan Shouhell <raihaanhimself@gmail.com>
Co-Authored-By: Tim Jacomb <t.jacomb@kainos.com>
Co-Authored-By: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Apply suggestions from code review

Co-Authored-By: Jeff Thompson <37345299+jeffret-b@users.noreply.github.com>
Co-Authored-By: Francisco Fernández <31063239+fcojfernandez@users.noreply.github.com>

* Maintainer guide - Replace the first role by "contributor"

* Maintainer guide - Add more details

* Maintainer guide - address some feedback

* Apply suggestions from code review by @daniel-beck

Co-Authored-By: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Update .github/PULL_REQUEST_TEMPLATE.md

Co-Authored-By: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Maintainer guide - more updates

* Maintainer Guide: Add info about the Security Releases and merges + add an explicit Jenkins LTS section

Addresses comments from @daniel-beck and @olivergondza

* Maintainer guide: reference the advisories

* Apply suggestions from code review

Co-Authored-By: Mark Waite <mark.earl.waite@gmail.com>
Co-Authored-By: Raihaan Shouhell <raihaanhimself@gmail.com>
Co-Authored-By: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Apply suggestions from code review

Co-Authored-By: Mark Waite <mark.earl.waite@gmail.com>

* Fix typos

* Expand code review goals: documentation and code styles

* Maintainer guide: Document the squash-merge policy

* Apply suggestions from code review

Co-Authored-By: Mark Waite <mark.earl.waite@gmail.com>

Co-authored-by: Raihaan Shouhell <raihaanhimself@gmail.com>
Co-authored-by: Tim Jacomb <t.jacomb@kainos.com>
Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>
Co-authored-by: Jeff Thompson <37345299+jeffret-b@users.noreply.github.com>
Co-authored-by: Francisco Fernández <31063239+fcojfernandez@users.noreply.github.com>
Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>

Co-Authored-By: Adrien Lecharpentier <adrien.lecharpentier@gmail.com>

Co-Authored-By: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

The build no longer works with Maven 3.5.3.  If you try it, you end up with this:

[INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (display-info) @ jenkins-parent ---
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.RequireMavenVersion failed with message:
3.5.4+ required to use Incrementals.
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Jenkins main module 2.199-SNAPSHOT ................. FAILURE [ 44.098 s]

* Reference redirectors and jenkins.io as much as possible

* Something went wrong, so this is a troubleshooting URL

* More specific redirect URLs

https://github.com/blog/1184-contributing-guidelines