Added example/test plugin

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

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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.

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