Added a readme to mount hook

Author: fcruzcscs

src/mount/README.md

@@ -0,0 +1,41 @@
+# mount Hook for Sarus Suite
+
+A small OCI hook that bind-mounts host files / directories /devices into the container without modifying the container image. 
+
+## How It Works
+
+* Read mount definitions from the configuration
+* Perform bind mounts into the bundle before the container process starts
+
+## Configuration
+
+### Environment Variables
+
+The hook is configured passing the host LDCONFIG path via environment variable:
+
+| Variable        | Description                             |
+|-----------------|-----------------------------------------|
+| `LDCONFIG_PATH` | Path to `ldconfig` on host              |
+
+### Enabling the Hook
+
+When registered, the hook always runs.
+
+~~~
+{
+  "version": "1.0.0",
+  "hook": {
+    "path": "/scratch/local/podman-hooks/bin/mount_hook",
+    "args": ["mount_hook",
+      "--mount=type=bind,src=${HOME},dst=/mnt/hostbind,readonly"
+    ],
+    "env": [
+      "LDCONFIG_PATH=/sbin/ldconfig"
+    ]
+  },
+  "when": {
+    "always": true
+  },
+  "stages": ["createContainer"]
+}
+~~~