Add more examples for AkashJS library usage

[anilmurty]

To help people getting started with using the AkashJS library, it would be great to have a few more examples.

Examples we have here

• Wallet Creation
• Estimating Gas
• Generic Unsigned Transaction (like querying something)
• Signed Transaction (sending funds)
• Querying Deployments
• Take down deployment

Examples we could use:

• Certificate Management:
  • Generate & Publish Certificate
  • Revoke certificate
• Deployment Management:
  • Create Deployment
  • Check for bids
  • Create lease from bid
  • List all deployments
  • Get deployment details for a single deployment (by GSEQ)
  • Close Deployment (clean up existing "take down" example)
• Query Providers
  • List all providers
  • Get details of a single provider
  • Get lease status for a specific lease (to retrieve deployment URI)

[zJuuu]

I just created a PR #39 to add some basic query providers examples. Wll try to add more examples in the next days

[anilmurty]

Thanks @zJuuu !