Merge pull request #427 from swarren12/feature/doc-improvements

Change `.md` files to `.adoc` in project root

CHANGELOG.adoc

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+:Author: LMAX Development Team
+:Email:
+:Date: {docdata}
+
+include::./src/docs/asciidoc/en/changelog.adoc[]

README.adoc

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+= LMAX Disruptor
+
+image:https://github.com/LMAX-Exchange/disruptor/workflows/Java%20CI%20with%20Gradle/badge.svg[Java CI with Gradle,link=https://github.com/LMAX-Exchange/disruptor/actions/workflows/gradle-build.yml]
+image:https://github.com/LMAX-Exchange/disruptor/workflows/CodeQL/badge.svg[CodeQL,link=https://github.com/LMAX-Exchange/disruptor/actions/workflows/codeql-analysis.yml]
+image:https://img.shields.io/github/license/LMAX-Exchange/disruptor[License,link=https://github.com/LMAX-Exchange/disruptor/blob/master/LICENCE.txt]
+
+A High Performance Inter-Thread Messaging Library
+
+== Maintainer
+
+LMAX Development Team
+
+== Support
+
+ - Open a ticket in GitHub https://github.com/LMAX-Exchange/disruptor/issues[issue tracker]
+ - https://groups.google.com/group/lmax-disruptor[Google Group]
+
+== Documentation
+
+* https://lmax-exchange.github.io/disruptor/[Overview]
+* https://lmax-exchange.github.io/disruptor/user-guide/index.html[User Guide]
+* https://lmax-exchange.github.io/disruptor/javadoc/com.lmax.disruptor/module-summary.html[API Documentation]
+* https://lmax-exchange.github.io/disruptor/developer-guide/index.html[Developer Guide]
+* https://github.com/LMAX-Exchange/disruptor/wiki/Frequently-Asked-Questions[FAQ]
+
+