Update README.md

README.md

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-"# numerical-method-grapher" 
+# Graphing and calculating numerical methods
+
+Features:
+
+- Bisection method
+- False rule method
+- Fixed-point method
+- Newthon-Rhapson method
+- Secant method
+- Gauss-Jordan method
+- Jaccobi method
+- Gauss-Seidel method
+- Linear regression method
+- Interpolation method
+- Quadratic interpolation method
+- Split-difference method
+- LaGrange interpolation method