Create README.md

README.md

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+# GC-Content Calculator 
+
+## Description 
+* Tool for calculating and plotting the GC content of one or multiple sequences taken in as user input. 
+* User can choose between calculating total GC content of each sequence or performing sliding window analysis (SWAN) for the calculation of the GC content for each window,
+  to reveal patterns of variability along nucleotide sequences.
+
+## Outputs
+* Single sequence / Simple calculation    : Floating point number
+* Single sequence / SWAN                  : Simple line plot
+* Multiple sequences / Simple calculation : Barplot
+* Multiple sequences / SWAN               : Line plot with multiple y values
+
+## Libraries
+- matplotlib
+- biopython