Fixes #1535: Add Javadocs for Post.java

[vibhcool]

Fixes:-

1. issue Add Javadocs for Post.java #1535
2. improves code readability

Short description

I have:

• There is a corresponding issue for this pull request.
• Mentioned the Issue number in the pull request commit message Fixes #<number> commit message
• There is only strictly only one commit per issue.

For the reviewers

I have:

• Reviewed this pull request by an authorized contributor.
• The reviewer is assigned to the pull request.

[vibhcool]

PR is open for review

[codecov-io]

Codecov Report

Merging #1536 into development will not change coverage.
The diff coverage is 13.33%.

@@              Coverage Diff              @@
##             development   #1536   +/-   ##
=============================================
  Coverage           9.27%   9.27%           
  Complexity           424     424           
=============================================
  Files                208     208           
  Lines              19230   19230           
  Branches            3532    3532           
=============================================
  Hits                1783    1783           
  Misses             17129   17129           
  Partials             318     318

Impacted Files	Coverage Δ	Complexity Δ
src/org/loklak/harvester/Post.java	26.98% <13.33%> (ø)	4 <1> (ø)	⬇️

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[mariobehling]

Cheers!