Add .clang-tidy config with minimal checks

[Ozaq]

The commited .clang-tidy file contains only a single check and no automated tidy runs are done.

The added check is readability-delete-null-pointer, i.e. tidy warns on superflous nullptr check before calling delete.

This commit also fixes a missing include in Report.h because this clang-tidy would otherwise report this tempalte instanciation as erroneous.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.43%. Comparing base (cf3be11) to head (0abc7a0).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #52      +/-   ##
===========================================
- Coverage    64.43%   64.43%   -0.01%     
===========================================
  Files          238      238              
  Lines        13839    13838       -1     
  Branches      1334     1334              
===========================================
- Hits          8917     8916       -1     
  Misses        4922     4922              

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