Documentation for netsniff installation

Author: MateuszGrabuszynski

tests/validation/create_pcap_file/netsniff_readme.md

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+# Automated packet capture using Netsniff-ng
+
+## Downloading and installing the tool
+
+> **Note:** At the moment, there is no automation present for netsniff-ng tool installation on the capturing machine. It must be installed on the system manually before running the test. If the capture fails, the test continues without the packet capture.
+
+There is an official instruction on how to download the tool present on the [tool's website](http://netsniff-ng.org/). It can also be useful for finding mirrors of the repositories. Below, only the Github repository is considered as a source.
+
+```shell
+NETSNIFF_REPO="https://github.com/netsniff-ng/netsniff-ng"
+NETSNIFF_VERSION="v0.6.9"
+```
+
+### Download the repository
+
+1. Clone the repository
+2. Change directory to the cloned repository
+3. Checkout on the proper release branch
+
+```shell
+git clone "${NETSNIFF_REPO}" netsniff-ng # 1.
+cd netsniff-ng # 2.
+git checkout "${VERSION}" # 3.
+```
+
+Alternatively:
+
+1. Download the release package
+2. Unpack the package
+
+```shell
+wget "${NETSNIFF_REPO}/archive/refs/tags/${NETSNIFF_VERSION}.tar.gz" # 1.
+tar xvz "${NETSNIFF_VERSION}" # 2.
+```
+
+### Install the repository
+
+> **Note:** The [document](https://github.com/netsniff-ng/netsniff-ng/blob/main/INSTALL) is also available online (main branch)
+
+1. Use the INSTALL document from repository root to install the tool