Add documentation for the mkllfs utility

docs/mkllfs.md

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+# MKLLFS (Make Linked List File System)
+
+## Introduction
+The llfs filesystem can be generated using the mkllfss utility. It is a simple filesystem that uses a linked list to store files. 
+The filesystem is stored in a single c file (llfs_data.c), which can be compiled and read by the llfs library. 
+The llfs filesystem is a flat filesystem, meaning that it does not support directories.
+
+The mkllfs utilit can be used to generate the `llfs_data.c` file. The `llfs_data.c` file from a directory with files.
+
+## Usage
+The mkllfs utility can be used as follows:
+```bash
+mkllfs [options] <directory> <output_file>
+```
+For example:
+```bash
+mkllfs data llfs_data.c
+```
+Available options:
+```
+  -h, --help           show the help message and exit
+  -v, --version        print the version of mkllfs and the llfs library that it generates for
+```
+
+## Building
+The mkllfs utility can be built using the following command:
+```bash
+gcc -o mkllfs mkllfs.c
+```
+For windows, you can use the following command:
+```bash
+gcc -o mkllfs.exe mkllfs.c
+```