HBASE-27513 Modify README.txt to mention how to contribue

README.md

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+  http://www.apache.org/licenses/LICENSE-2.0
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+
+![hbase-logo](https://raw.githubusercontent.com/apache/hbase/master/src/site/resources/images/hbase_logo_with_orca_large.png)
+
+[Apache HBase](https://hbase.apache.org) is an open-source, distributed, versioned, column-oriented store modeled after Google' [Bigtable](https://research.google.com/archive/bigtable.html): A Distributed Storage System for Structured Data by Chang et al. Just as Bigtable leverages the distributed data storage provided by the Google File System, HBase provides Bigtable-like capabilities on top of [Apache Hadoop](https://hadoop.apache.org/).
+
+# Getting start
+To get started using HBase, the full documentation for this release can be found under the doc/ directory that accompanies this README. Using a browser, open the docs/index.html to view the project home page (or browse https://hbase.apache.org). The hbase '[book](https://hbase.apache.org/book.html)' has a 'quick start' section and is where you should being your exploration of the hbase project.
+
+The latest HBase can be downloaded from the [download page](https://hbase.apache.org/downloads.html).
+
+We use mailing lists to send notice and discuss. The mailing lists and archives are listed [here](http://hbase.apache.org/mail-lists.html)
+
+# How to contribute
+The source code can be found at https://hbase.apache.org/source-repository.html
+
+The HBase issue tracker is at https://hbase.apache.org/issue-tracking.html
+
+Notice that, the public registration for https://issues.apache.org/ has been disabled due to spam. If you want to contribute to HBase, please send an email to [[email protected]](mailto:[email protected]) in the follow format so the HBase PMC members can acquire a jira account for you:
+
+```
+Subject: Request for Jira account
+
+Contents of the mail(should be in English):
+Preferred Jira Id:
+Full Name:
+E-Mail Address:
+
+Reason: Jira Id you wish to contribute to, or details around the bug/feature you wish to report or work on.
+```
+
+> **_NOTE:_** we need to process the requests manually so it may take sometime, for example, up to a week, for us to respond to your request.
+
+# About
+Apache HBase is made available under the [Apache License, version 2.0](https://hbase.apache.org/license.html)
+
+The HBase distribution includes cryptographic software. See the export control notice [here](https://hbase.apache.org/export_control.html).