feat: cleanup README and add test-ca files for testing

sample-server/.python-version

@@ -0,0 +1 @@
+3.6.4

sample-server/fullchain.pem

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+../test-ca/end.fullchain

sample-server/key.pem

@@ -0,0 +1 @@
+../test-ca/end.key

sample-server/main.py

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+from flask import Flask, request
+app = Flask(__name__)
+app.debug = True
+
+@app.route('/')
+def hello_world():
+    print(f"{request.method} {request.url}")
+    return 'Hello, World!'
+
+app.run(
+    debug=True,
+    ssl_context=('fullchain.pem', 'key.pem'),
+    port=5000
+)