Preparar para publicar en Read the Docs

Signed-off-by: Edgar Alvarado Taleno <edgar.alvaradotaleno@ucr.ac.cr>

flask-docs/_sources/extensions.rst.txt

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+Extensions
+==========
+
+Extensions are extra packages that add functionality to a Flask
+application. For example, an extension might add support for sending
+email or connecting to a database. Some extensions add entire new
+frameworks to help build certain types of applications, like a REST API.
+
+
+Finding Extensions
+------------------
+
+Flask extensions are usually named "Flask-Foo" or "Foo-Flask". You can
+search PyPI for packages tagged with `Framework :: Flask <pypi_>`_.
+
+
+Using Extensions
+----------------
+
+Consult each extension's documentation for installation, configuration,
+and usage instructions. Generally, extensions pull their own
+configuration from :attr:`app.config <flask.Flask.config>` and are
+passed an application instance during initialization. For example,
+an extension called "Flask-Foo" might be used like this::
+
+    from flask_foo import Foo
+
+    foo = Foo()
+
+    app = Flask(__name__)
+    app.config.update(
+        FOO_BAR='baz',
+        FOO_SPAM='eggs',
+    )
+
+    foo.init_app(app)
+
+
+Building Extensions
+-------------------
+
+While `PyPI <pypi_>`_ contains many Flask extensions, you may not find
+an extension that fits your need. If this is the case, you can create
+your own, and publish it for others to use as well. Read
+:doc:`extensiondev` to develop your own Flask extension.
+
+
+.. _pypi: https://pypi.org/search/?c=Framework+%3A%3A+Flask