add example of OllamaGenerator

integrations/ollama/example/example.py

@@ -0,0 +1,27 @@
+from haystack import Pipeline
+from haystack.components.retrievers import InMemoryBM25Retriever
+from haystack.document_stores import InMemoryDocumentStore
+from haystack.components.builders.prompt_builder import PromptBuilder
+
+from ollama_haystack import OllamaGenerator
+
+template = """
+Given the following information, answer the question.
+
+Context: 
+{% for document in documents %}
+    {{ document.content }}
+{% endfor %}
+
+Question: What's the official language of {{ country }}?
+"""
+pipe = Pipeline()
+document_store = InMemoryDocumentStore()
+
+pipe.add_component("retriever", InMemoryBM25Retriever(document_store=document_store))
+pipe.add_component("prompt_builder", PromptBuilder(template=template))
+pipe.add_component("llm", OllamaGenerator(model='orca-mini'))
+pipe.connect("retriever", "prompt_builder.documents")
+pipe.connect("prompt_builder", "llm")
+
+pipe.run({"prompt_builder": {"country": "Ghana"}})