tests: created tests dir

The tests where cluttering the src dir
so i moved them to a separate dir.
Same goes for the binaries so i changed the
outputdirectory for them and
added these to the new gitignore file

.gitignore

@@ -0,0 +1,3 @@
+bin
+docs
+secret.nim

tests/chessTest.nim

@@ -1,7 +1,7 @@
 import einheit
 import algorithm
 
-include ./chess.nim
+include chess
 
 testSuite ChessTest of TestSuite:
 

tests/engineTest.nim

@@ -1,7 +1,7 @@
 import einheit
 
-include ./chess.nim
-include ./engine.nim
+include chess
+include engine
 
 testSuite ChessTest of TestSuite:
 

tests/nim.cfg

@@ -0,0 +1,2 @@
+--path:"../src/"
+--outdir:"../bin/tests/"