Initial project commit

* Implemented elections mandate calculation as described in
https://www.cik.bg/f/105;
* Included temporary input text files in the solution to permit easy
debugging.
Fixes and refactoring

* Changed target .NET framework version to 3.5;
* Fixed a bug in independent candidate mandate assignment;
* Refactored code to split relatively independent operations into
separate methods;
* Renamed some variables and class members to make them less confusing;
* Added README information.
Final fixes and documentation

* Changed vote count type to long (because the total vote count can go
up to 2^32 - 1);
* Added documentation and improved comments in code;
* Removed temporary test input files from solution.
Merge pull request #6 from musashibg/master

musashibg's solution