Current testing project added

WORKS:
+2D visualize

NOT WORKS:
-all tests
3d animation was added
del unused code for command line arguments
Project structure changed

/src
/include
/test

Implementation moved from headers to .c files
.gitignore added
speed calculation was added into Verlet function
fixed previous commit
added timing and cmd-line arguments
updated gitignore and PeriodicBorders func
Merge pull request #1 from savonichev-andr/testing

Testing