docs: add image-generator cookbook

Signed-off-by: tylerslaton <[email protected]>

Author: tylerslaton

docs/docs/101-cookbook/image-generator.md

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+# Image Generator
+
+In this example, let's say that we want to create an image generator tool that will take a prompt from the user and generate an image based on that prompt but
+in a specific style that we tell the tool to use.
+
+1. Clone the image-generation tool repository from Github.
+
+    ```shell
+    git clone https://github.com/gptscript-ai/image-generation
+    ```
+
+2. Bootstrap the tool.
+
+    ```shell
+    make bootstrap
+    ```
+
+3. Create a file called `painter.gpt`.
+
+    ```yaml
+    tools: ./image-generation/tool.gpt, sys.download, sys.write
+    args: prompt: (required) The prompt to use for generating the image.
+
+    Generate the ${prompt} in the style of a 17th century impressionist oil painting.
+
+    Write the resulting image to a file named "painting.png".
+    ```
+
+4. Run the script.
+
+    ```shell
+    gptscript painter.gpt --prompt "a city skyline at night"
+    ```
+
+This will generate an image of a city skyline at night in the style of a 17th century impressionist oil painting and write the resulting image to a file named `painting.png`.
+
+## Recap
+In this example, we have created a GPTScript that leverages the `image-generation` tool to generate an image based on a prompt. We gave it some flexibility by specifiying an argument `prompt` that the user can provide when running the script. We also specified gave the script a specific style of the image that we want to generate, that being a 17th century impressionist oil painter.
+
+Notable things to point out:
+#### Tools
+The `tools` directive was used here to reference the `image-generation` tool and the `sys.download` and `sys.write` system tools. GPTScript will know the tools availble to it and will use them when it sees fit in the script.
+
+#### Args
+We used the `args` directive to specify the `prompt` argument that the user can provide when running the script. This is a required argument and the user must provide it when running the script.
+
+#### Interpolation
+The `${prompt}` syntax can we used to reference the `prompt` argument in the script. This is a made-up syntax and can be replaced with any other syntax that you prefer. The LLM should be able to understand the syntax and use the argument in the script.