Adding tool specific docs

docs/tools/YoutubeVideoSearchTool.md

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+# YoutubeVideoSearchTool
+
+## Description
+
+This tool is part of the `crewai_tools` package and is designed to perform semantic searches within Youtube video content, utilizing Retrieval-Augmented Generation (RAG) techniques. It is one of several "Search" tools in the package that leverage RAG for different sources. The YoutubeVideoSearchTool allows for flexibility in searches; users can search across any Youtube video content without specifying a video URL, or they can target their search to a specific Youtube video by providing its URL.
+
+## Installation
+
+To utilize the YoutubeVideoSearchTool, you must first install the `crewai_tools` package. This package contains the YoutubeVideoSearchTool among other utilities designed to enhance your data analysis and processing tasks. Install the package by executing the following command in your terminal:
+
+```
+pip install 'crewai[tools]'
+```
+
+## Example
+
+To integrate the YoutubeVideoSearchTool into your Python projects, follow the example below. This demonstrates how to use the tool both for general Youtube content searches and for targeted searches within a specific video's content.
+
+```python
+from crewai_tools import YoutubeVideoSearchTool
+
+# General search across Youtube content without specifying a video URL, so the agent can search within any Youtube video content it learns about irs url during its operation
+tool = YoutubeVideoSearchTool()
+
+# Targeted search within a specific Youtube video's content
+tool = YoutubeVideoSearchTool(youtube_video_url='https://youtube.com/watch?v=example')
+```
+## Arguments
+
+The YoutubeVideoSearchTool accepts the following initialization arguments:
+
+- `youtube_video_url`: An optional argument at initialization but required if targeting a specific Youtube video. It specifies the Youtube video URL path you want to search within.