feat(fs): add VFS, initrd, and filesystem interface headers

include/fs.h

@@ -0,0 +1,32 @@
+#ifndef FROSTBYTE_FS_H
+#define FROSTBYTE_FS_H
+
+#define oReadOnly  0x0
+#define oWriteOnly 0x1
+#define oReadWrite 0x2
+#define oCreate    0x40
+#define oTrunc     0x200
+#define oAppend    0x400
+
+#define seekSet 0
+#define seekCur 1
+#define seekEnd 2
+
+#define fsTypeFile 1
+#define fsTypeDir  2
+
+#define fsNameMax 64
+
+typedef struct FbStat {
+    unsigned long size;
+    unsigned int type;
+    unsigned int mode;
+} FbStat;
+
+typedef struct FbDirent {
+    unsigned int type;
+    unsigned int nameLength;
+    char name[fsNameMax];
+} FbDirent;
+
+#endif