Nfb: Add README

Author: Pavel Siska

src/plugins/input/nfb/README.md

@@ -0,0 +1,22 @@
+# NFB (input plugin)
+
+Receive packets over nfb (Netcope FPGA Board). Requires a special network card with compatible
+firmware for high-speed packet processing. Suitable for speeds of 100 Gbps and above.
+
+## Example configuration
+
+```yaml
+input_plugin:
+  ndp:
+    device: "/dev/nfb0"
+    queues: "0,1,2,3-15"
+```
+
+## Parameters
+
+**Mandatory parameters:**
+
+|Parameter | Description |
+|---|---|
+|__device__| Path to the NFB device to be used. Typically /dev/nfb0 or /dev/nfb/by-serial-no/{card-serial} |
+|__queues__| List of queues to be used for packet reception. The queues can be specified as a comma-separated list (e.g., 0,1,2) or a range (e.g., 3-15). This is required to determine which specific receive queues to use on the NFB device. |