docs(ollama): more info and vision models with tool calling

Author: boczekbartek

docs/vendors.md

@@ -2,14 +2,63 @@
 
 ## Ollama
 
-For installation see: https://ollama.com/
+For installation see: https://ollama.com/. Then start
+[ollama server](https://github.com/ollama/ollama?tab=readme-ov-file#start-ollama) with
+`ollama serve` command.
 
 ```python
 from langchain_community.chat_models import ChatOllama
 
 llm = ChatOllama(model='llava')
 ```
 
+### Configure ollama wth OpenAI compatible API
+
+Ollama supports OpenAI compatible APIs (see [details](https://ollama.com/blog/openai-compatibility)).
+
+> [!TIP]
+> Such setup might be more convenient if you frequently switch between OpenAI API and
+> local models.
+
+To configure ollama through OpenAI API in `rai`:
+
+1. Add `base_url` to [config.toml](../config.toml)
+
+```toml
+[openai]
+simple_model = "llama3.2"
+complex_model = "llama3.2"
+...
+base_url = "http://localhost:11434/v1"
+```
+
+### Example of setting up vision models with tool calling
+
+In this example `llama3.2-vision` will be used.
+
+1. Create a custom ollama `Modelfile` and load the model
+
+> [!NOTE]
+> Such setup is not officially supported by Ollama and it's not guaranteed to be
+> working in all cases.
+
+```shell
+ollama pull llama3.2
+echo FROM llama3.2-vision > Modelfile
+echo 'TEMPLATE """'"$(ollama show --template llama3.2)"'"""' >> Modelfile
+ollama create llama3.2-vision-tools
+```
+
+3. Configure the model through OpenAI compatible API in [config.toml](../config.toml)
+
+```toml
+[openai]
+simple_model = "llama3.2-vision-tools"
+complex_model = "llama3.2-vision-tools"
+...
+base_url = "http://localhost:11434/v1"
+```
+
 ## OpenAI
 
 ```bash