diff --git a/README.md b/README.md
index 87c1760f..bea76b18 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,15 @@
 # time-tracker-api
 
+## Getting started
+Follow the following instructions to get the project ready to use ASAP:
+
+### Requirements
+Be sure you have installed in your system
+
+- [Python version 3](https://www.python.org/download/releases/3.0/) in your path. It will install
+automatically [pip](https://pip.pypa.io/en/stable/) as well.
+- A virtual environment, namely [venv](https://docs.python.org/3/library/venv.html).
+
 ## Setup
 
 - Create and activate the environment,
@@ -36,4 +46,5 @@
     flask run
     ```
 
-- Open `http://127.0.0.1:5000/` in a browser
\ No newline at end of file
+- Open `http://127.0.0.1:5000/` in a browser. You will find in the presented UI 
+a link to the swagger.json with the definition of the api.
\ No newline at end of file
diff --git a/time_tracker_api/__init__.py b/time_tracker_api/__init__.py
index 03db688f..61cec3f1 100644
--- a/time_tracker_api/__init__.py
+++ b/time_tracker_api/__init__.py
@@ -1,12 +1,14 @@
 from flask import Flask
-from flask_restplus import Api
 
 
 def create_app():
     flask_app = Flask(__name__)
-    app = Api(app=flask_app)
 
-    from time_tracker_api.projects.projects_endpoints import ns as projects_ns
-    app.add_namespace(projects_ns)
+    init_app(flask_app)
 
     return flask_app
+
+
+def init_app(app: Flask):
+    from .api import api
+    api.init_app(app)
diff --git a/time_tracker_api/activities/activities_api.py b/time_tracker_api/activities/activities_api.py
new file mode 100644
index 00000000..b9578842
--- /dev/null
+++ b/time_tracker_api/activities/activities_api.py
@@ -0,0 +1,57 @@
+from flask_restplus import fields, Resource, Namespace
+
+ns = Namespace('activities', description='API for activities')
+
+# Activity Model
+activity = ns.model('Activity', {
+    'id': fields.String(readOnly=True, required=True, title='Identifier',
+                         description='The unique id of the activity'),
+    'name': fields.String(required=True, title='Name', max_length=50,
+                          description='Canonical name of the activity'),
+    'description': fields.String(title='Description',
+                                 description='Comments about the activity'),
+    'tenant_id': fields.String(required=True, title='Tenant', max_length=64,
+                               description='The tenant this belongs to')
+})
+
+
+@ns.route('/')
+class Activities(Resource):
+    @ns.doc('list_activities')
+    @ns.marshal_list_with(activity, code=200)
+    def get(self):
+        """List all available activities"""
+        return []
+
+    @ns.doc('create_activity')
+    @ns.expect(activity)
+    @ns.marshal_with(activity, code=201)
+    @ns.response(400, 'Invalid format of the attributes of the activity.')
+    def post(self):
+        """Create a single activity"""
+        return ns.payload, 201
+
+
+@ns.route('/<string:id>')
+@ns.response(404, 'Activity not found')
+@ns.param('id', 'The unique identifier of the activity')
+class Activity(Resource):
+    @ns.doc('get_activity')
+    @ns.marshal_with(activity)
+    def get(self, id):
+        """Retrieve all the data of a single activity"""
+        return {}
+
+    @ns.doc('delete_activity')
+    @ns.response(204, 'The activity was deleted successfully (No content is returned)')
+    def delete(self, id):
+        """Deletes a activity"""
+        return None, 204
+
+    @ns.doc('put_activity')
+    @ns.response(400, 'Invalid format of the attributes of the activity.')
+    @ns.expect(activity)
+    @ns.marshal_with(activity)
+    def put(self, id):
+        """Updates an activity"""
+        return ns.payload
diff --git a/time_tracker_api/api.py b/time_tracker_api/api.py
new file mode 100644
index 00000000..4f2742fa
--- /dev/null
+++ b/time_tracker_api/api.py
@@ -0,0 +1,12 @@
+
+from flask_restplus import Api
+
+api = Api(version='1.0.1', title="TimeTracker API",
+          description="API for the TimeTracker project")
+
+# APIs
+from time_tracker_api.projects import projects_api
+api.add_namespace(projects_api.ns)
+
+from time_tracker_api.activities import activities_api
+api.add_namespace(activities_api.ns)
diff --git a/time_tracker_api/projects/projects_endpoints.py b/time_tracker_api/projects/projects_api.py
similarity index 96%
rename from time_tracker_api/projects/projects_endpoints.py
rename to time_tracker_api/projects/projects_api.py
index eabc6fa8..5cbbd0f1 100644
--- a/time_tracker_api/projects/projects_endpoints.py
+++ b/time_tracker_api/projects/projects_api.py
@@ -2,7 +2,7 @@
 from .projects_model import project_dao
 from time_tracker_api.errors import MissingResource
 
-ns = Namespace('projects', description='Api for resource `Projects`')
+ns = Namespace('projects', description='API for projects (clients)')
 
 @ns.route('/')
 class Projects(Resource):