doc: qsfsd documentation

Author: RawanMostafa08

docs/cmds/qsfsd.md

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+# Qsfsd
+
+The `QSFS` (Quantum Safe File System) package provides a secure and distributed file system implementation for the ZOS ecosystem while maintaining the standard filesystem interface.
+
+`qsfsd` manages the `qsfs`package
+
+## How it works
+
+- Connects to `Redis` message broker over `zbus`
+- Registers itself as the `qsfsd` module to expose its methods through `zbus`
+
+## Usage
+
+```sh
+qsfsd  --root /var/cache/modules/qsfsd  \
+       --broker unix:///var/run/redis.sock \
+       --workers 2
+```
+
+### Command-line flags
+
+| Flag        | Description                                | Default                      |
+| ----------- | -------------------------------------------| ---------------------------- |
+| `--broker`  | Connection string to the message BROKER    | `unix:///var/run/redis.sock` |
+| `--root`    | ROOT working directory of the module       | `/var/cache/modules/qsfsd`  |
+| `--workers` | Number of workers N                        | `1`                          |