README Improve MIME4J README (#57)

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+Apache James MIME4J
+===================
+
+image:https://img.shields.io/badge/Join%20us-Mailing%20lists-purple.svg[link="https://james.apache.org/mail.html"]
+link:https://gitter.im/apache/james-project[image:https://badges.gitter.im/apache/james-project.svg[Join the chat at link:https://gitter.im/apache/james-project]]
+image:https://img.shields.io/badge/CI-Jenkins-blue.svg[link="https://ci-builds.apache.org/job/james/job/ApacheJames-Mime4J/"]
+image:https://img.shields.io/badge/Documentation-green.svg[link="https://james.apache.org/mime4j/index.html"]
+image:https://img.shields.io/badge/Downloads-0.8.5-yellow.svg[link="https://james.apache.org/download.cgi#Apache_Mime4J"]
+image:https://img.shields.io/badge/Tickets-JIRA-blue.svg[link="https://issues.apache.org/jira/projects/MIME4J/issues"]
+image:https://img.shields.io/badge/License-ApacheV2-orange.svg[link="https://www.apache.org/licenses/"]
+image:https://img.shields.io/badge/Latests-news-red.svg[link="https://james.apache.org/index.html#posts"]
+
+image::james-logo.png[link="https://james.apache.org"]
+
+*Mime4j* can be used to parse e-mail message streams in plain
+link:https://datatracker.ietf.org/doc/html/rfc822[rfc822] and MIME format
+and to build a tree representation of an e-mail message.
+
+The parser uses a callback mechanism to report parsing events such as the start of
+an entity header, the start of a body. The parser has been designed to be extremely
+tolerant against messages violating the standards.
+
+Mime4j can also be used to build a tree representation of an e-mail message via the DOM API.
+
+== How to contribute?
+
+.Read more...
+[%collapsible]
+====
+James is a project that lives from the contributions of its community! Anyone can contribute!
+
+Read https://james.apache.org/index.html#third[how to contribute].
+
+We more than welcome *articles* and *blog posts* about James. Contact us by https://james.apache.org/mail.html[email]
+or on https://gitter.im/apache/james-project[Gitter] to share your experiences.
+
+*Documentation* is an easy way to get started, and more than wanted! Check out the https://issues.apache.org/jira/issues/?jql=project%20%3D%MIME4J%20AND%20resolution%20%3D%20Unresolved%20AND%20labels%20%3D%20documentation%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC[~documentation] label on JIRA.
+
+And to get started with *code contributions*, search out the
+https://issues.apache.org/jira/issues/?jql=project%20%3D%20MIME4J%20AND%20resolution%20%3D%20Unresolved%20AND%20labels%20%3D%20newbie%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC[~newbie],
+https://issues.apache.org/jira/issues/?jql=project%20%3D%20MIME4J%20AND%20resolution%20%3D%20Unresolved%20AND%20labels%20%3D%20easyfix%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC[~easyfix],
+https://issues.apache.org/jira/issues/?jql=project%20%3D%20MIME4J%20AND%20resolution%20%3D%20Unresolved%20AND%20labels%20%3D%20feature%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC[~feature] labels on JIRA.
+
+There is many other ways one can help us: packaging, communication, etc ...
+====
+
+== Maven dependencies
+
+.Read more...
+[%collapsible]
+====
+Add this maven dependency to import MIME4J core:
+
+....
+<dependency>
+    <groupId>org.apache.james</groupId>
+    <artifactId>apache-mime4j-core</artifactId>
+    <version>0.8.5</version>
+</dependency>
+....
+
+Add this maven dependency to import MIME4J dom:
+
+....
+<dependency>
+    <groupId>org.apache.james</groupId>
+    <artifactId>apache-mime4j-dom</artifactId>
+    <version>0.8.5</version>
+</dependency>
+....
+====
+
+== How to compile the project
+
+.Read more...
+[%collapsible]
+====
+We require link:https://maven.apache.org[maven] version 3.6.0 minimum to build the project.
+
+Simply run `mvn clean install` within this directory to compile the project.
+
+Useful options includes:
+
+- `-DskipTests` to skip the long to execute resource consuming test suite that requires a docker daemon.
+- `-T 4` to parallelize the build on several CPUs.
+====
+
+== How to use MIME4J
+
+We maintain a set of link:examples/src/main/java/org/apache/james/mime4j/samples[examples] detailing how one can use MIME4J.