Create setup_model.md

Author: minhngh

setup_model.md

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+This guide helps you configure the environment for different models
+
+  * OpenAI
+
+Please set the following environment variables:
+```bash
+ OPENAI_API_KEY="your_api_key_here"
+```
+
+Run AgileCoder by specifying the backend model as GPT-3.5 or GPT-4 below:
+
+```bash
+agilecoder --task <yourtask> --model "GPT_3_5_TURBO"
+agilecoder --task <yourtask> --model "GPT_4"
+```
+
+  * Anthropic
+
+Please set the following environment variables:
+```bash
+MODEL_NAME=<a_model_name_of_claude>
+ANTHROPIC_API_KEY=<your_api_key>
+```
+where MODEL_NAME is the model name supported by Claude, e.g. `claude-3-haiku-20240307`
+
+Run AgileCoder by running the command below:
+```bash
+agilecoder --task <yourtask> --model "ANTHROPIC_CLAUDE"
+```
+
+  * Ollama
+
+Please host your model on the url `http://localhost:11434/api/chat`, and set the following variables:
+```bash
+MODEL_NAME=<model_name>
+```
+where MODEL_NAME is the model name supported by Ollama, e.g. llama3
+Run AgileCoder by running the command below:
+```bash
+agilecoder --task <yourtask> --model "OLLAMA"
+```