kde-builder: add page

[Managor]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages/linux/kde-builder.md seems to be a copy of pages/linux/kdesrc-build.md (53% matching).

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[kbdharun]

Thanks for your contribution, for now, I would like to only add this suggestion, based on discussion #13441, I will make a few suggestions for the short options soon.

[kbdharun]

Hi, sorry for the delay (had a lot of work the past few days). After adding this the PR should be GTG.