Start from an orange3-example-addon

.gitignore

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+# Build files
+build
+dist
+*.egg-info/*
+*.so
+*.la
+*.o
+*.py[doc]
+MANIFEST
+
+# Cython generated files
+__pycache__
+
+# Editor files
+.idea
+.idea/*
+*~
+.project
+.pydevproject
+.settings/*
+.DS_Store

MANIFEST.in

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+# Ref https://docs.python.org/2/distutils/sourcedist.html#commands
+recursive-include orangecontrib *.ows icons/*
+global-exclude __pycache__

README.md

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+Orange3 Example Add-on
+======================
+
+This is an example add-on for [Orange3](http://orange.biolab.si). Add-on can extend Orange either 
+in scripting or GUI part, or in both. We here focus on the GUI part and implement a simple (empty) widget,
+register it with Orange and add a new workflow with this widget to example tutorials.
+
+Installation
+------------
+
+To install the add-on, run
+
+    python setup.py install
+
+To register this add-on with Orange, but keep the code in the development directory (do not copy it to 
+Python's site-packages directory), run
+
+    python setup.py develop
+
+Usage
+-----
+
+After the installation, the widget from this add-on is registered with Orange. To run Orange from the terminal,
+use
+
+    python -m Orange.canvas
+
+The new widget appears in the toolbox bar under the section Example.
+
+![screenshot](https://github.com/biolab/orange3-example-addon/blob/master/screenshot.png)

orangecontrib/__init__.py

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+__import__("pkg_resources").declare_namespace(__name__)
+# orangecontrib is a namespace modules shared by multiple Orange add-on so it
+# needs to declare namespace.

orangecontrib/infrared/tutorials/example_tutorial.ows

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+<?xml version='1.0' encoding='utf-8'?>
+<scheme description="" title="Example Workflow" version="2.0">
+	<nodes>
+		<node id="0" name="Example Widget" position="(129.0, 126.0)" project_name="Orange3-Example-Add-on" qualified_name="orangecontrib.example.widgets.mywidget.MyWidget" title="Example Widget" version="" />
+	</nodes>
+	<links />
+	<annotations>
+		<arrow end="(183.0, 144.0)" fill="#C1272D" id="0" start="(283.0, 238.0)" />
+		<text font-family="Helvetica" font-size="16" id="1" rect="(259.0, 260.0, 150.0, 44.0)">This is a wiget from an addon</text>
+	</annotations>
+	<thumbnail />
+	<node_properties>
+		<properties format="pickle" node_id="0">gAN9cQBYEwAAAHNhdmVkV2lkZ2V0R2VvbWV0cnlxAWNzaXAKX3VucGlja2xlX3R5cGUKcQJYDAAA
+AFB5UXQ0LlF0Q29yZXEDWAoAAABRQnl0ZUFycmF5cQRDLgHZ0MsAAQAAAAAGEQAABHQAAAbYAAAE
+7QAABhEAAASKAAAG2AAABO0AAAAAAABxBYVxBodxB1JxCHMu
+</properties>
+	</node_properties>
+</scheme>

orangecontrib/infrared/widgets/__init__.py

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+# Category metadata.
+
+# Category icon show in the menu
+ICON = "icons/category.svg"
+
+# Background color for category background in menu
+# and widget icon background in workflow.
+BACKGROUND = "light-blue"

orangecontrib/infrared/widgets/mywidget.py

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+from PyQt4 import QtCore, QtGui
+from Orange.widgets.widget import OWWidget
+from Orange.widgets import gui
+
+
+class MyWidget(OWWidget):
+    # Widget needs a name, or it is considered an abstract widget
+    # and not shown in the menu.
+    name = "Hello World"
+    icon = "icons/mywidget.svg"
+    want_main_area = False
+
+    def __init__(self):
+        super().__init__()
+
+        label = QtGui.QLabel("Hello, World!")
+        self.controlArea.layout().addWidget(
+            label, QtCore.Qt.AlignCenter | QtCore.Qt.AlignVCenter)

setup.py

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+#!/usr/bin/env python
+
+from setuptools import setup, find_packages
+
+ENTRY_POINTS = {
+    # Entry point used to specify packages containing tutorials accessible
+    # from welcome screen. Tutorials are saved Orange Workflows (.ows files).
+    'orange.widgets.tutorials': (
+        # Syntax: any_text = path.to.package.containing.tutorials
+        'exampletutorials = orangecontrib.example.tutorials',
+    ),
+
+    # Entry point used to specify packages containing widgets.
+    'orange.widgets': (
+        # Syntax: category name = path.to.package.containing.widgets
+        # Widget category specification can be seen in
+        #    orangecontrib/example/widgets/__init__.py
+        'Infrared = orangecontrib.infrared.widgets',
+    ),
+}
+
+KEYWORDS = (
+    # [PyPi](https://pypi.python.org) packages with keyword "orange3 add-on"
+    # can be installed using the Orange Add-on Manager
+    'orange3 add-on',
+)
+
+if __name__ == '__main__':
+    setup(
+        name="Orange-Infrared",
+        description='',
+        author='',
+        author_email='',
+        packages=find_packages(),
+        install_requires=[
+            'Orange',
+        ],
+        entry_points=ENTRY_POINTS,
+        keywords=KEYWORDS,
+        namespace_packages=['orangecontrib'],
+        include_package_data=True,
+        zip_safe=False,
+    )