edited README.rst

README.rst

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+# Author: Kuznetsova E. <eakuznetsova@cosmos.ru>, Shtykovsky A.
+
+========
+arttools
+========
+
+This package was created as a storage of tools for processing of ART-XC data. The package will be updated with other tools as they are created.
+
+At the current moment artools contains only arttime module. The arttime tool allows to calculate artdays and/or mission time based on Mosckow time (and UTC) or MJD and convert them to each other. 
+
+----------
+To install:
+----------
+
+Clone the repo to your computer::
+
+git clone https://github.com/eblur/newdust.git newdust/
+
+Enter the repo and install it with:: 
+
+cd <PATH_TO_ARTTOOLS>
+pip intstall .
+
+To invoke::
+
+from arttools import arttime