Add new hello-world sample

[pruthvidhodda]

Describe the proposal

Add a new simple hello-world sample with Spring in IntelliJ environment. Demonstrate state-store or pub-sub functionality. Adapt the sample to be deployed locally and as well in k8s mode.

[artursouza]

This issue can be an adapted version in Java of the following quickstarts:

https://github.com/dapr/quickstarts/blob/master/hello-world
https://github.com/dapr/quickstarts/blob/master/hello-kubernetes

[VermaNishant978]

/assign

[mukundansundar]

@VermaNishant978 are you still working on this? Can we get an ETA for this?