Added README

README.md

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+# mandelplot
+### Generate mandelbrot set with specified dimensions, a couple of palettes included !
+
+## Usage
+mandelplot [OPTIONS]
+
+OPTIONS:
+
+- `-d, --image_dimensions <image_dimensions>` => Set image dimensions (WIDTHxHEIGHT) [default: 7680x4320]
+
+- `-h, --help` => Print help information
+
+- `-i, --max_iter <max_iter>` => Specify maximum amount of iterations to decide whether the point escapes to infinity or  not [default: 1000]
+
+- `-n, --image_name <image_name>` => Set output image filename [default: mandelbrot]
+
+- `-p, --palette <palette>` => Specify bulb color (light, dark) [default: light]
+
+- `-V, --version` => Print version information
+
+
+## TODO:
+- generate image in parallel