Create backend tests

[dshuffma-ibm]

Create automated tests to verify the backend works appropriately.

• run install script test
• run instantiate script test
• send invokes to create a marble test
• query a marble test

[jerezereh]

Do you want to test each of these tasks individually or do you want the test to automate the installing and instantiating to test the send, create, and query tasks?

[dshuffma-ibm]

I'll accept PRs that accomplish this in pieces. Maybe I should make this an epic. I'm thinking you should be able to run each test individually, or chain them. Each of these steps is a pre-req for the next, so chaining them makes sense. ie: you won't be able to create a marble before installing + instantiating the chaincode, so calling the create marble test should call the install chaincode and instantiate test.

I guess i'm thinking of these test running on a brand new, uninitialized setup. BUT I'm open to making it run on an existing setup. If the network was already in use, you could fire the query marble test w/o running the install/instantiate/invoke tests...

Also i'll go make a contributing readme.

update CONTRIBUTING.md

[panchuprodhan]

How to query the creation and transfer of the marbles in the blockchain?
Also, how to view the whole ledger?