Add Application base

Add python ignore types
Add Readme changes for development

.gitignore

@@ -1 +1,15 @@
 .env
+venv/
+
+*.pyc
+__pycache__/
+
+instance/
+
+.pytest_cache/
+.coverage
+htmlcov/
+
+dist/
+build/
+*.egg-info/

README.md

@@ -1,2 +1,8 @@
 # period
 
+## Development
+
+```
+export FLASK_APP=period; export FLASK_ENV=development; flask run
+
+```

period/__init__.py

@@ -0,0 +1,25 @@
+import os
+from flask import Flask
+
+def create_app(test_config=None):
+    app = Flask(__name__, instance_relative_config=True)
+    app.config.from_mapping(
+        SECRET_KEY='dev',
+        DATABASE=os.path.join(app.instance_path, 'period.sqlite')
+    )
+
+    if test_config is None:
+        app.config.from_pyfile('config.py', silent=True)
+    else:
+        app.config.from_mapping(test_config)
+
+    try:
+        os.makedirs(app.instance_path)
+    except OSError:
+        pass
+
+    @app.route('/hello')
+    def hello():
+        return 'Hello, World!'
+
+    return app