added conda installation instructions and badge

[sarthakpati]

Description

This PR adds conda installation instructions and associated status badge for documentation.

Fixes #30

How Has This Been Tested?

This is a purely documentation change. The tests for the conda pacage are integrated in the recipe itself [ref].

Checklist:

• I have read and acknowledged Google's Open Source
  Code of conduct.
• I have read the
  Contributing
  page, and I either signed the Google
  Individual CLA
  or am covered by my company's
  Corporate CLA.
• I have discussed my proposed solution with code owners in the linked
  issue(s) and we have agreed upon the general approach.
• I have made any needed documentation changes, or noted in the linked
  issue(s) that documentation elsewhere needs updating.
• I have added tests, or I have ensured existing tests cover the changes
• I have followed
  Google's Python Style Guide
  and ran pylint over the affected code.

[sarthakpati]

Hi @aksg87, I am unsure why one of the "Validate PR template" jobs isn't running for this PR. Do you think you could provide some guidance?

[github-actions]

Manual validation results:

Size: 7 lines
Template: ✓
Linked issue: ✓

Run ID: 16790879477

[github-actions]

Manual validation results:

Size: 7 lines
Template: ✓
Linked issue: ✓

Run ID: 16791201077

[github-actions]

Manual Validation Results

Status: ❌ Failed

Check	Status	Details
PR Size	✅	7 lines
Template	✅	Complete
Linked Issue	✅	Found

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[github-actions]

Manual Validation Results

Status: ✅ Passed

Check	Status	Details
PR Size	✅	7 lines
Template	✅	Complete
Linked Issue	✅	Found

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