Added filesystem module

src/filesystem.h

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2016 rxi
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the MIT license. See LICENSE for details.
+ */
+
+#ifndef FILESYSTEM_H
+#define FILESYSTEM_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+
+enum {
+  FILESYSTEM_ESUCCESS =  0,
+  FILESYSTEM_EFAILURE = -1,
+};
+
+const char* filesystem_strerror(int err);
+void filesystem_deinit(void);
+int filesystem_mount(const char *path);
+int filesystem_unmount(const char *path);
+int filesystem_exists(const char *filename);
+int filesystem_isFile(const char *filename);
+int filesystem_isDirectory(const char *filename);
+void* filesystem_read(const char *filename, int *size);
+void filesystem_free(void *ptr);
+
+#endif