add pre-commit hook

[t-bltg]

Description

Add pre-commit hooks, so that the following checks are done:

$ git add .
$ git commit -a -m <msg>
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...............................................................Passed
check for added large files..............................................Passed
check runic formatting...................................................Passed
[<branch> 57db8f9a] <msg>
 xx files changed, xx insertions(+), xx deletions(-)

This enhances code quality.