Added update_task_progress example

import time

import os

import json

from openflexure_microscope.devel import MicroscopePlugin

from openflexure_microscope.devel import MicroscopePlugin, update_task_progress

from .api import DoAPI, TaskAPI

    def generate_random_numbers_for_a_while(self, run_time: int):

        self.run_time = run_time

        vals = []

        for _ in range(run_time):

        for t in range(run_time):

            vals.append(random.random())

            time.sleep(1)

            # Update task progress (if running as a task)

            percent_complete = int(((t + 1)/run_time)*100)

            update_task_progress(percent_complete)

        return vals