added README

README.md

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+Quart-HTTPAuth
+==============
+
+[![Build status](https://github.com/miguelgrinberg/Flask-HTTPAuth/workflows/build/badge.svg)](https://github.com/miguelgrinberg/Flask-HTTPAuth/actions) [![codecov](https://codecov.io/gh/miguelgrinberg/Flask-HTTPAuth/branch/master/graph/badge.svg?token=KeU2002DHo)](https://codecov.io/gh/miguelgrinberg/Flask-HTTPAuth)
+
+Simple extension that provides Basic, Digest and Token HTTP authentication for Quart routes.
+
+
+Basic authentication example
+----------------------------
+
+```python
+from quart import Quart
+from quart_httpauth import HTTPBasicAuth
+from werkzeug.security import generate_password_hash, check_password_hash
+
+app = Quart(__name__)
+auth = HTTPBasicAuth()
+
+users = {
+    "john": generate_password_hash("hello"),
+    "susan": generate_password_hash("bye")
+}
+
+@auth.verify_password
+def verify_password(username, password):
+    if username in users and \
+            check_password_hash(users.get(username), password):
+        return username
+
+@app.route('/')
+@auth.login_required
+async def index():
+    return "Hello, %s!" % auth.current_user()
+
+if __name__ == '__main__':
+    app.run()
+```
+
+
+Digest authentication example
+-----------------------------
+
+```python
+from quart import Quart
+from flask_httpauth import HTTPDigestAuth
+
+app = Quart(__name__)
+app.config['SECRET_KEY'] = 'secret key here'
+auth = HTTPDigestAuth()
+
+users = {
+    "john": "hello",
+    "susan": "bye"
+}
+
+@auth.get_password
+def get_pw(username):
+    if username in users:
+        return users.get(username)
+    return None
+
+@app.route('/')
+@auth.login_required
+async def index():
+    return "Hello, %s!" % auth.username()
+
+if __name__ == '__main__':
+    app.run()
+```