java implementation of enry

Signed-off-by: Miguel Molina <miguel@erizocosmi.co>

java/README.md

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+# enry-java
+
+### Requirements
+
+* `sbt`
+* `Java` (tested with Java 1.8)
+* `maven` install and on the PATH (only for local usage)
+* `Go` (only for building the shared objects for your operating system)
+
+### Generate jar with Java bindings and shared libraries
+
+You need to do this before exporting the jar and/or testing.
+
+```
+make
+```
+
+This will download JNAerator and build its jar to generate the code from the `libenry.h` header file (hence the need for `mvn` installed), it will be placed under `lib`.
+The shared libraries for your operating system will be built if needed and copied inside the `shared` directory.
+
+For IntelliJ and other IDEs remember to mark `shared` folder as sources and add `lib/enry.jar` as library. If you use `sbt` from the command line directly that's already taken care of.
+
+### Run tests
+
+```
+make test
+```
+
+### Export jar
+
+```
+make package
+```
+
+Jar will be located in `./target/enry-java-assembly-X.X.X.jar`.