Move main module to src/main.d.

src/main.d

@@ -0,0 +1,6 @@
+import std.stdio;
+
+int main(string[] args)
+{
+    return 0;
+}

src/pegp/main.d

@@ -1,10 +0,0 @@
-module pegp.main;
-import std.stdio;
-import pegp.board;
-
-int main(string[] args)
-{
-    Board s = new Board(3);
-    writeln("Peg Puzzle! Position: ", Board.Position(2, 0));
-    return 0;
-}