add get LED img tool

tools/get_LED_Img.py

+import numpy as np
+from observation_sim.instruments import Chip, Filter, FilterParam
+import astropy.io.fits as fits
+from observation_sim.mock_objects import FlatLED
+
+# 输入打开的LED名字列表led_type_list和对应的打开时间列表exp_t_list
+
+
+def get_LED_Img(chipID=8, led_type_list=['LED1'], exp_t_list=[0.1]):
+    chip = Chip(chipID)
+    filter_id, filter_type = chip.getChipFilter()
+    filt = Filter(
+        filter_id=filter_id,
+        filter_type=filter_type,
+        filter_param=FilterParam())
+    led_obj = FlatLED(chip, filt)
+    led_flat, ledstat, letts = led_obj.drawObj_LEDFlat(
+        led_type_list=led_type_list, exp_t_list=exp_t_list)
+    return led_flat
+
+
+if __name__ == "__main__":
+    chipid = 7
+    led_type_list = ['LED5', 'LED6', 'LED7', 'LED8']
+    exp_t_list = [0.1, 8, 9, 10]
+
+    led_img = get_LED_Img(
+        chipID=chipid, led_type_list=led_type_list, exp_t_list=exp_t_list)
+    fits.writeto('test_led.fits', led_img)