Make diktat-cli executable

[nulls]

What's done:

• insert shell script on top of jar file

It closes #1842

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c7cad50) 78.44% compared to head (055d3d1) 78.44%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1843 +/- ## ========================================= Coverage 78.44% 78.44% Complexity 2455 2455 ========================================= Files 133 133 Lines 8644 8644 Branches 2184 2184 ========================================= Hits 6781 6781 Misses 896 896 Partials 967 967 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[github-actions[bot]]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   164 files  ±0     164 suites  ±0   8m 39s :stopwatch: + 3m 11s 1 413 tests +5  1 377 :heavy_check_mark: +5  36 :zzz: ±0  0 :x: ±0  2 792 runs  +5  2 756 :heavy_check_mark: +5  36 :zzz: ±0  0 :x: ±0 

Results for commit 54066701. ± Comparison against base commit 65d55581.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   164 files  ±0     164 suites  ±0   6m 48s :stopwatch: -17s 1 413 tests +5  1 396 :heavy_check_mark: +5  17 :zzz: ±0  0 :x: ±0  2 792 runs  +5  2 775 :heavy_check_mark: +5  17 :zzz: ±0  0 :x: ±0 

Results for commit 54066701. ± Comparison against base commit 65d55581.

:recycle: This comment has been updated with latest results.