Add an overview for the javaenv Docker image (#370)

Signed-off-by: Mark S. Lewis <Mark.S.Lewis@outlook.com>

Author: bestbeforetoday

fabric-chaincode-docker/README.md

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+# Quick reference
+
+- **Maintained by**:  
+  [The Fabric Java chaincode maintainers](https://github.com/hyperledger/fabric-chaincode-java)
+
+# Overview
+
+This image is used by the default [Hyperledger Fabric](https://hyperledger-fabric.readthedocs.io/) chaincode builder when deploying Java smart contracts. It is not intended for use independently of Hyperledger Fabric.
+
+# Image variants
+
+Image tags correspond broadly to the major and minor version of Hyperledger Fabric for which they are primarily intended. More detailed information on image tags, interoperability, and supported Java versions can be found in the [compatibility](https://github.com/hyperledger/fabric-chaincode-java/blob/main/COMPATIBILITY.md) documentation.
+
+# License
+
+This image is provided under the [Apache-2.0](https://github.com/hyperledger/fabric-chaincode-java/blob/main/LICENSE) license.