added a bit of doc and some games

src/overlayfs.h

@@ -1,6 +1,15 @@
 #ifndef __OVERLAY_H__
 #define __OVERLAY_H__
 
+/**
+ * @brief Overlayfs is what make it possible to deploy to the game files without altering anything.
+ * it allows us to overlay multiple folder over the game files. like appling filters to an image.
+ * @param sources a null ended table of folder that will overlay of the game files
+ * @param dest the overlayed folder(the game data folder)
+ * @param upperdir the director that will store the changed files
+ * @param workdir a directory that will contains only temporary files.
+ * @return int error code
+ */
 int overlayMount(char ** sources, const char * dest, const char * upperdir, const char * workdir);
 
 #endif