update the readme file

Author: ougx

README.md

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+# Python Programming in Geoscience
+
+Dr. Michael Ou
+
+School of Natural Resources
+
+University of Nebraska-Lincoln
+
+
+--------
+To submit your exercise solution, please
+
+1. copy the exercise notebook file and rename it as `week(5)_exercise_fist_last.ipynb`
+
+2. add cells below each question and write your solution in those cells. Please test you code and generate and save the output.
+
+3. using `git` to commit the changes of your solution
+
+4. push your change to your github repo (which should be forked from my github repo) and create a `pull request`.