add knapsack solver script for binary executable;

[timgluz]

Hi,

this PR adds an additional solver.py script to call compiled executable and it passes a content of a test file via stdin. This way a solution doesn't have to deal with file opening & closing;

Testing:

1. copy knapsack.rs from here: https://gist.github.com/timgluz/0a41ee27e37ccbd68c79400197ba4bf6

2. compile the example solution: rustc knapsack.rs
   nb: here's a tutorial how to install Rust: https://www.rust-lang.org/tools/install

3. test the script: python solverBash.py ./data/ks_4_0

[codecov-io]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #45   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files          17       17           
  Lines        1059     1059           
=======================================
  Hits          948      948           
  Misses        111      111           

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