[EPIC]: Implement fundamental filsystem operations

[ByteOtter]

Fundamental fs operations include:

• Mounting the image #4
• Unmounting the image #5
• Reading directory entries #6
• Reading file contents #7
• Changing directories #8
• Writing data to file #9
• Creating new files and directories #10
• Deleting files and directories #11

Some of these operations may not be strictly necessary or may be out of scope. They shall be labeled as such.