fix: add uvicorn dependency

feat: add test_api file

test_api.py

@@ -0,0 +1,8 @@
+# test api endpoint with a signature, print the response
+import urllib.request
+
+response = urllib.request.urlopen(
+    "http://localhost:8001/api/validate-signature?signature=ST%20250%20U42%20%2815%29",
+)
+
+print(response.read().decode("utf-8"))