Added requirements.txt and README.md for ppl other than me

.gitignore

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+# Visual Studio Code
+.vscode/
+
+# Environments
+.env
+.   
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/

README.md

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+# Riemann Sum Python Thing
+This is my Riemann Sum Implementation with Turtle I did during the 2018/2019 Holidays
+
+You can install the dependencies (scipy & numpy) by typing `pip install -r requirements.txt`, in the project root. 
+Make sure to use a virtual environment! (though this is more of a reminder for myself then anyone else.)

requirements.txt

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+astroid==2.3.3
+isort==4.3.21
+lazy-object-proxy==1.4.3
+mccabe==0.6.1
+numpy==1.17.4
+pylint==2.4.4
+scipy==1.3.3
+six==1.13.0
+typed-ast==1.4.0
+wrapt==1.11.2