initiate position calibration pipeline

csst/msc/astrometry.py

+from ..core.processor import CsstProcessor
+
+
+class CsstProcMscPositionCalibration(CsstProcessor):
+    def prepare(self, **args):
+        # prepare the environment
+        # for example, if you make use of some third-party software like SEXTRACTOR,
+        # do your preparation here.
+        pass
+
+    def run(self, data, *args, **kwargs):
+        # run your pipeline here
+        # make sure that your input data should be a child class instance of CsstData.
+        pass
+
+    def cleanup(self, **kwargs):
+        # clean up environment
+        pass