Add usage documentation to README

1 files changed, 38 insertions, 1 deletions

diff --git a/README.md b/README.md
index 32ebf55..6247e70 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,39 @@
 # skopos
-A gRPC server that facilitates provisioning and updating containers
+A gRPC server that facilitates provisioning and updating containers.
+
+## Usage
+### List USB Devices
+Replace IP address accordingly.
+```bash
+grpcurl -plaintext -import-path ./proto -proto ormos.proto -d '{}' '10.0.0.42:50052' unit.containers.v0.Ormos.ListUsbDevices
+```
+
+Example output (device not mounted):
+```json
+{
+  "devices": [
+    {
+      "devicePath": "/dev/sda"
+    },
+    {
+      "devicePath": "/dev/sda1"
+    }
+  ]
+}
+```
+
+Example output (device mounted):
+```json
+{
+  "devices": [
+    {
+      "devicePath": "/dev/sda"
+    },
+    {
+      "devicePath": "/dev/sda1",
+      "isMounted": true,
+      "mountPoint": "/mnt/usb"
+    }
+  ]
+}
+```