Add DEVELOPMENT.md file

[jjbustamante]

The DEVELOPMENT.md file already exists in kpack but it is under docs folder, this PR is just for moving the file to the place require for the kpack donation to CNB

Fixes #1136

[codecov-commenter]

Codecov Report

Merging #1185 (ca1d155) into main (2282235) will not change coverage.
The diff coverage is n/a.

❗ Current head ca1d155 differs from pull request most recent head 87cfe76. Consider uploading reports for the commit 87cfe76 to get more accurate results

@@           Coverage Diff           @@
##             main    #1185   +/-   ##
=======================================
  Coverage   70.03%   70.03%           
=======================================
  Files         132      132           
  Lines        6671     6671           
=======================================
  Hits         4672     4672           
  Misses       1570     1570           
  Partials      429      429           

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