Update test.yaml, add Pipfile, and delete httpbin.py

.github/workflows/test.yaml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: pytest
+name: tests
 
 on:
   push:

Pipfile

@@ -0,0 +1,22 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+responder = {file = ".", editable = true}
+pytest = "*"
+pytest-mock = "*"
+twine = "*"
+sphinx = "*"
+marshmallow = "*"
+pydantic = "*"
+pytest-cov = "*"
+ruff = "*"
+pre-commit = "*"
+httpx = "*"
+
+[dev-packages]
+
+[requires]
+python_version = "3.11"