Adds a quickstart README for java with working instructions

java/README.md

@@ -0,0 +1,59 @@
+gRPC in 3 minutes (Java)
+========================
+
+PREREQUISITES
+-------------
+
+- [Java 8](http://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html)
+
+- [Maven 2.3](http://maven.apache.org/users/index.html).
+  - this is needed to install Netty5, a dependency of gRPC, and to build this sample
+
+- [Latest version of google-protobuf](https://github.com/google/protobuf/tree/master/java)
+  - to generate java code from proto files
+  - to install the base Java proto3 library
+
+
+INSTALL
+-------
+
+1 Clone the gRPC Java git repo
+```sh
+$ cd <path/to/your/working_dir>
+$ git clone https://github.com/grpc/grpc-java
+```
+
+2 Install gRPC Java, as described in [How to Build](https://github.com/grpc/grpc-java#how-to-build)
+```sh
+$ # from this dir
+$ cd grpc-java
+$ # follow the instructions in 'How to Build'
+```
+
+3 Clone this repo, if you've not already done so.
+```sh
+$ cd <path/to/your/working_dir>
+$ git clone https://github.com/grpc/grpc-common
+$ cd grpc-common/java  # switch to this directory
+```
+
+4 Build the samples
+```sh
+$ # from this directory
+$ mvn package
+```
+
+TRY IT!
+-------
+
+- Run the server
+```sh
+$ # from this directory
+$ ./run_greeter_server.sh &
+```
+
+- Run the client
+```sh
+$ # from this directory
+$ ./run_greeter_client.sh
+```