Docs: Create a simple draft of the documentaiton

Simple draft of the documentation for the MTL
gstreamer plugin.

Co-authored-by: Kasiewicz, Marek <[email protected]>

ecosystem/gstreamer_plugin/README.md

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+# Gstreamer plugin for MTL
+
+## Building the gstreamer plugins
+
+```shell
+cd Media-Transport-Library/ecosystem/gstreamer_plugin
+meson setup build
+ninja -C build
+```
+
+## Running the pipeline
+
+### St20 rawvideo plugin
+
+To run the st20 rawvideo plugin you need to pass the path to the plugin to your
+gstreamer aplication.
+
+you need to also prepare v210 video
+
+```shell
+export INPUT="path_to_the_input_v210_file"
+
+# you can prode it with gst-launch-1.0
+gst-launch-1.0 -v videotestsrc pattern=ball ! video/x-raw,width=1920,height=1080,format=v210,framerate=60/1 ! filesink location=$INPUT
+```
+
+```shell
+
+export VFIO_PORT_T="pci address of the device"
+export GSTREAMER_PLUGINS_PATH="path to the folder with builded plugins"
+
+# video pipeline
+gst-launch-1.0 ! filesrc location=$INPUT ! \
+'video/x-raw,width=1920,height=1080,format=(string)I422_10LE,framerate=(fraction)60/1' ! rawvideoparse ! \
+mtltxsink tx-queues=4 tx-udp-port=20000 tx-payload-type=112 dev-ip="192.168.96.3" tx-ip="239.168.75.30" dev-port=$VFIO_PORT_T \
+--gst-plugin-path $GSTREAMER_PLUGINS_PATH
+
+
+# looping video pipeline
+gst-launch-1.0 multifilesrc location=$INPUT loop=true ! \
+video/x-raw,format=v210,height=1080,width=1920,framerate=60/1 ! rawvideoparse format=v210 height=1080 width=1920 framerate=60/1 ! \
+mtltxsink tx-queues=4 tx-udp-port=20000 tx-payload-type=112 dev-ip="192.168.96.3" tx-ip="239.168.75.30" dev-port=$VFIO_PORT_T \
+--gst-plugin-path $GSTREAMER_PLUGINS_PATH
+```

ecosystem/gstreamer_plugin/build.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+BUILD_DIR="builddir"
+DEBUG=false
+
+# Parse command-line arguments
+for arg in "$@"; do
+    case $arg in
+        --debug)
+        DEBUG=true
+        shift
+        ;;
+        *)
+        shift
+        ;;
+    esac
+done
+
+if [ -d "$BUILD_DIR" ]; then
+    echo "Removing existing build directory..."
+    rm -rf "$BUILD_DIR" || { echo "Failed to remove existing build directory"; exit 1; }
+fi
+
+if [ "$DEBUG" = true ]; then
+    meson setup --buildtype=debug "$BUILD_DIR"
+else
+    meson setup "$BUILD_DIR"
+fi
+
+meson compile -C "$BUILD_DIR"