Add single header and single source entries for all components as well as the full library (#2)

Reviewed-on: #2
Co-authored-by: Abdelrahman <said.abdelrahman89@gmail.com>
Co-committed-by: Abdelrahman <said.abdelrahman89@gmail.com>

src/wapp.c

@@ -0,0 +1,9 @@
+#ifndef WAPP_C
+#define WAPP_C
+
+#include "wapp.h"
+#include "wapp_core.c"
+#include "wapp_os.c"
+#include "wapp_testing.c"
+
+#endif // !WAPP_C