Adding US keyboard as a modification of the UK keyboard.

olcPixelGameEngine.h

@@ -3604,8 +3604,13 @@ namespace olc
 			{olc::Key::U, "u", "U"}, {olc::Key::V, "v", "V"}, {olc::Key::W, "w", "W"}, {olc::Key::X, "x", "X"}, {olc::Key::Y, "y", "Y"},
 			{olc::Key::Z, "z", "Z"},
 
+#ifndef OLC_KEYBOARD_US /* UK Keyboard */
 			{olc::Key::K0, "0", ")"}, {olc::Key::K1, "1", "!"}, {olc::Key::K2, "2", "\""}, {olc::Key::K3, "3", "#"},	{olc::Key::K4, "4", "$"},
 			{olc::Key::K5, "5", "%"}, {olc::Key::K6, "6", "^"}, {olc::Key::K7, "7", "&"}, {olc::Key::K8, "8", "*"},	{olc::Key::K9, "9", "("},
+#else /* US Keyboard : Shift-2 (") swapped with Shift-' (@) , Shift-3 is # and not Ł */
+			{olc::Key::K0, "0", ")"}, {olc::Key::K1, "1", "!"}, {olc::Key::K2, "2", "@"}, {olc::Key::K3, "3", "#"},	{olc::Key::K4, "4", "$"},
+			{olc::Key::K5, "5", "%"}, {olc::Key::K6, "6", "^"}, {olc::Key::K7, "7", "&"}, {olc::Key::K8, "8", "*"},	{olc::Key::K9, "9", "("},
+#endif
 
 			{olc::Key::NP0, "0", "0"}, {olc::Key::NP1, "1", "1"}, {olc::Key::NP2, "2", "2"}, {olc::Key::NP3, "3", "3"},	{olc::Key::NP4, "4", "4"},
 			{olc::Key::NP5, "5", "5"}, {olc::Key::NP6, "6", "6"}, {olc::Key::NP7, "7", "7"}, {olc::Key::NP8, "8", "8"},	{olc::Key::NP9, "9", "9"},
@@ -3613,8 +3618,13 @@ namespace olc
 
 			{olc::Key::PERIOD, ".", ">"}, {olc::Key::EQUALS, "=", "+"}, {olc::Key::COMMA, ",", "<"}, {olc::Key::MINUS, "-", "_"}, {olc::Key::SPACE, " ", " "},
 
+#ifndef OLC_KEYBOARD_US /* UK Keyboard */
 			{olc::Key::OEM_1, ";", ":"}, {olc::Key::OEM_2, "/", "?"}, {olc::Key::OEM_3, "\'", "@"}, {olc::Key::OEM_4, "[", "{"},
 			{olc::Key::OEM_5, "\\", "|"}, {olc::Key::OEM_6, "]", "}"}, {olc::Key::OEM_7, "#", "~"}, 
+#else /* US Keyboard : Shift-2 (") swapped with Shift-' (@) , one less key so tilde is on backtick key */
+			{olc::Key::OEM_1, ";", ":"}, {olc::Key::OEM_2, "/", "?"}, {olc::Key::OEM_3, "`", "~"}, {olc::Key::OEM_4, "[", "{"},
+			{olc::Key::OEM_5, "\\", "|"}, {olc::Key::OEM_6, "]", "}"}, {olc::Key::OEM_7, "\'", "\""}, 
+#endif
 			
 			// {olc::Key::TAB, "\t", "\t"}
 		};