docs: Add write support documentations

[jiangmichaellll]

This needs to wait until #131 and #122 are checked in.

[codecov]

Codecov Report

Merging #132 (7dfe2c3) into master (1e20e48) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #132   +/-   ##
=========================================
  Coverage     59.36%   59.36%           
  Complexity      130      130           
=========================================
  Files            25       25           
  Lines           753      753           
  Branches         31       31           
=========================================
  Hits            447      447           
  Misses          298      298           
  Partials          8        8           

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[jiangmichaellll]

Now that both PRs are checked in it's ready for review.

[anguillanneuf]

Could you spell out "Here's an example in Python" and "Here's an example in Java"? It's because it won't be clear in the Preview form. LGTM after that.