Add README

src/crewai_tools/tools/serpapi_tool/README.md

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+# SerpApi Tools
+
+## Description
+[SerpApi](https://serpapi.com/) tools are built for searching information in the internet. It currently supports:
+- Google Search
+- Google Shopping
+
+To successfully make use of SerpApi tools, you have to have `SERPAPI_API_KEY` set in the environment. To get the API key, register a free account at [SerpApi](https://serpapi.com/).
+
+## Installation
+To start using the SerpApi Tools, you must first install the `crewai_tools` package. This can be easily done with the following command:
+
+```shell
+pip install 'crewai[tools]'
+```
+
+## Examples
+The following example demonstrates how to initialize the tool
+
+### Google Search
+```python
+from crewai_tools import SerpApiGoogleSearchTool
+
+tool = SerpApiGoogleSearchTool()
+```
+
+### Google Shopping
+```python
+from crewai_tools import SerpApiGoogleShoppingTool
+
+tool = SerpApiGoogleShoppingTool()
+```