Onboard buffer overrun case from clang-tidy-mistakes repo to awesome-bugs

[mximp]

To consolidate cases for static analysis let's move first case from clang-tidy-mistakes: https://github.com/polystat/clang-tidy-mistakes/blob/master/false-negative/buffer-overrun.cpp

For that need to create bad/good code fragments for c++, Java, Python.
Initial code needs to be cleaned up from comments and irrelevant structures/statements.

[mximp]

@yegor256 please assign to myself (maybe I can get rights to assign issues in this repo?).

[yegor256]

@mximp I gave you permissions