Add README to WildFly-Discovery

README.md

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+WildFly Discovery
+============
+
+This project facilitates the location of services based on abstract descriptors. It consists of a service type and a filter specification.
+Current maven coordinates of the project is defined as
+`<groupId>org.wildfly.discovery</groupId>
+ <artifactId>wildfly-discovery-client</artifactId>
+ <version>1.2.2.Final-SNAPSHOT</version>`
+
+Each discovery API instance is associated with discovery providers which are able to
+provide answers to discovery queries.
+
+Building
+-------------------
+
+Prerequisites:
+
+* JDK 11 or newer - check `java -version`
+* Maven 3.6.0 or newer - check `mvn -v`
+
+To build with your own Maven installation:
+
+> mvn install
+
+Contributing
+------------------
+
+Find issues here: https://issues.jboss.org/browse/WFDISC
+
+Relevant Documentation
+------------------
+
+http://docs.wildfly.org/14/Client_Guide.html