Chore: Add documentation for context

Author: sangee2004

docs/docs/03-tools/05-context.md

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+# Context
+
+GPTScript supports context provider tools which can be used to provide additional context for tool execution.
+
+## Writing a Context Provider Tool
+
+A context provider tool looks just like any other GPTScript, with the following caveats:
+- It cannot call the LLM and must run a command.
+- It must print contents to stdout.
+- Tools can be provided using `Export`. Any tool defined in `Tools` will be ignored.
+
+Here is a simple example of a context provider tool that provides additional context to search tool:
+
+```yaml
+# my-search-context-tool.gpt
+name: search_context
+export: sys.http.html2text?
+
+#!/bin/bash
+echo You are an expert web researcher with access to the Search tool.If the search tool fails to return any information stop execution of the script with message "Sorry! Search did not retrun any results" . Feel free to get the contents of the returned URLs in order to get more information. Provide as much detail as you can. Also return the source of the search results.
+
+```
+
+## Using a Context Provider Tool
+
+Continuing with the above example, this is how you can use it in a script:
+
+```yaml
+context: search_context from  my-search-context-tool.gpt
+tools: github.com/gptscript-ai/search/duckduckgo
+
+What are some of the most popular tourist destinations in Scotland, and how many people visit them each year?
+
+```
+
+When you run this script, GPTScript will use the output from the context tool and add it to the user message along with the 
+existing prompt in this tool to provide additional context to LLM.
+
+## Context Provider Tool with args
+
+Here is an example of a context provider tool that uses args to decide which search tool to use when answering the user provided queries:
+
+```yaml
+# context_with_arg.gpt
+name: search_context
+export: github.com/gptscript-ai/search/duckduckgo, github.com/gptscript-ai/search/brave, sys.http.html2text?
+args: search_tool: tool to search with
+
+#!/bin/bash
+echo You are an expert web researcher with access to the ${search_tool} Search tool.If the search tool fails to return any information stop execution of the script with message "Sorry! Search did not retrun any results" . Feel free to get the contents of the returned URLs in order to get more information. Provide as much detail as you can. Also return the source of the search results.
+
+```
+
+Continuing with the above example, this is how you can use it in a script:
+
+```yaml
+# my_context_with_arg.gpt
+context: search_context from context_with_arg.gpt with ${search} as search_tool
+Args: search: Search tool to use
+
+What are some of the most popular tourist destinations in Scotland, and how many people visit them each year?
+
+```
+
+This script can be used to search with `brave` or `duckduckdb` tools depending on the search parameter passed to the tool.
+Example usage for using brave search tool:
+```yaml
+gptscript --disable-cache my_context_with_arg.gpt '{"search": "brave"}'
+```