Pcap: Add README

Author: Pavel Siska

src/plugins/input/pcap/README.md

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+# Pcap Live (input plugin)
+
+The Pcap Live input plugin allows for real-time packet capture on a specified network interface.
+
+## Example configuration
+
+```yaml
+input_plugin:
+  pcap_live:
+    interface: "eth0"
+    ### Optional parameters
+    snap_length: 65535
+    bpf_filter: null
+```
+
+## Parameters
+
+**Mandatory parameters:**
+
+|Parameter | Description |
+|---|---|
+|__interface__| The network interface to capture packets from (e.g., eth0, ens33, etc.). This is required for the plugin to know which network interface to monitor. |
+
+-----
+
+**Optional parameters:**
+|Parameter | Default | Description |
+|---|---|---|
+|__snap_length__   | 65535 | Maximum packet capture length in bytes. It defines the size of the packet that will be captured. The default value captures full packets (up to 65535 bytes). |
+|__bpf_filter__ | null | A Berkeley Packet Filter (BPF) string for packet filtering. If null, no filter is applied. If a filter is specified, only packets matching the filter criteria will be captured. |
+
+# Pcap File (input plugin)
+
+The Pcap File input plugin allows you to read and process packets from an existing .pcap file. This is useful for analyzing historical packet captures or testing with predefined data.
+
+## Example configuration
+
+```yaml
+input_plugin:
+  pcap_file:
+    file: "input.pcap"
+    ### Optional parameters
+    bpf_filter: null
+```
+
+## Parameters
+
+**Mandatory parameters:**
+
+|Parameter | Description |
+|---|---|
+|__file__| 	Path to the pcap file that contains the packet data to be read. |
+
+-----
+
+**Optional parameters:**
+|Parameter | Default | Description |
+|---|---|---|
+|__bpf_filter__ | null | A Berkeley Packet Filter (BPF) string for packet filtering. If null, no filter is applied. If a filter is specified, only packets matching the filter criteria will be captured. |