Improvements to checking accounts

[dadepo]

This PR

• sets the Program ID
• Adds a README.

The Program ID is required because if it is not set, the tests passes but shows no tests were run:

  0 passing (0ms)

✨  Done in 0.70s.

This is because the describe function, is annotated to be an async function. Removing the async keyword and running the test, the issue becomes obvious, and it fails with the following error:

ts-mocha -p ./tsconfig.json -t 1000000 ./tests/test.ts

Error: Invalid public key input
    at new PublicKey... 

[ngundotra]

Tagging @realbuffalojoe for review

[ngundotra]

But also, please see feedback on #10 about your README updates to create-account example

[buffalojoec]

lgtm