Adds a simple Mellea example. (#35)

Author: nrfulton

docs/examples/rag/mellea_pdf.py

@@ -0,0 +1,15 @@
+import mellea
+from mellea.stdlib.docs.richdocument import RichDocument
+
+m = mellea.start_session()
+
+doc = RichDocument.from_document_file(
+    "https://www.fs.usda.gov/foresthealth/docs/fidls/FIDL-78-ArmillariaRootDisease.pdf"
+)
+
+print(
+    m.instruct(
+        "Determine whether the mellea fungus only feeds on dead or weakened trees, thereby improving forest health",
+        grounding_context={"usfs": doc},
+    ).value
+)