Added example/test plugin

openflexure_microscope/plugins/__init__.py

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+from .loader import search_plugin_dirs, find_plugins, load_plugin, PluginMount, MicroscopePlugin

openflexure_microscope/plugins/default/test_plugin/__init__.py

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+from openflexure_microscope.plugins import MicroscopePlugin
+
+
+class FirstPlugin(MicroscopePlugin):
+    """
+    An example Microscope plugin. 
+    """
+    def run(self):
+        """
+        Demonstrate access to Microscope.camera, and Microscope.stage
+        """
+        print("Parent camera:")
+        print(self.camera)
+
+        print("Parent stage:")
+        print(self.stage)
+
+
+class OtherPlugin(MicroscopePlugin):
+    """
+    An example of a second Microscope plugin, loaded from the same plugin file.
+    """
+    def run(self):
+        print("Stage plugin parent stage:")
+        print(self.stage)
+
+
+PLUGINS = {
+    'test1': FirstPlugin,
+    'test2': OtherPlugin,
+}  #: dict: Dictionary describing the plugins. Keys are the names of the plugin's namescape, with a value corresponding to the class of that plugin.