Quality-of-life improvements to 'Getting Started' documentation.

[rgmz]

This PR makes two changes to the "Getting Started" section of the README:

1. It should make the push command work with any default branch name.
   Currently, if blindly copied & pasted and the repository has a different default branch, people will receive the error 'error: src refspec {name} does not match any'.
2. It explicitly states that SSH isn't supported yet.
   The instructions result in a confusing prompt + error if you only have SSH configured.

$ git push proxy main
Username for 'http://localhost:8000':
Password for 'http://localhost:8000':
remote: No anonymous write access.
fatal: Authentication failed for https://xxx

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: rgmz / name: Richard Gomez (97cfaf3, 54e9eba)
• ✅ login: JamieSlome / name: Jamie Slome (ffe2965, e07f908)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.35%. Comparing base (caa1fb7) to head (e07f908).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #464   +/-   ##
=======================================
  Coverage   57.35%   57.35%           
=======================================
  Files          39       39           
  Lines        1060     1060           
=======================================
  Hits          608      608           
  Misses        452      452           

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[maoo]

LGTM

[maoo]

@JamieSlome @coopernetes - any issues merging this?

@rgmz - Given your interest in the project, I was wondering if you'd be also interested to join our bi-weekly Zoom meeting where we coordinate around project activities; if that's the case, please email help@finos.org and I'll send out all the info you need to join. Thank you!

[JamieSlome]

@rgmz - any thoughts on the above comments? 👍 ❤️

[JamieSlome]

LGTM! 🍰