Java examples to be moved to a better location so that they are more visible and easily searchable #99

Currently Java examples are in fn project and fdk-java repos. It's very hard to find them.

With the move to a separate docs repo, we have an opportunity to make these more visible and easily searchable.

We have examples for:
• Running JAXRS apps in java https://github.com/fnproject/fn-jrestless-example
• Spring Cloud Function + Fn https://github.com/fnproject/fdk-java/blob/master/docs/SpringCloudFunctionSupport.md
• Testing with Java : https://github.com/fnproject/fdk-java/blob/master/docs/TestingFunctions.md
• Custom data Binding :https://github.com/fnproject/fdk-java/blob/master/docs/ExtendingDataBinding.md
• Configuration (includes a JDBC example) https://github.com/fnproject/fdk-java/blob/master/docs/FunctionConfiguration.md