Command to create-wallet

[K-Kumar-01]

Changes

A brief description of the changes in this PR:

• Closes #150
• Based on PR #190.
• Cleaned up commits.

Additional Requirements

• Documentation needs to be updated.

Tasks to complete before merging PR:

• [ ] Ensure system tests are passing. If not Run them manually to check for any regressions :clipboard:
• [ ] Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• [ ] Merge your system tests PR to master AFTER merging this PR