Update README.md

README.md

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 # linedraw
 Convert images to vectorized line drawings for plotters.
+![Alt text](/relative/path/to/img.jpg?raw=true "")
+
+## Dependencies
+Python 2, PIL/Pillow, numpy, OpenCV (Optional for better speed and results)
+
+## Usage
+Convert an image to line drawing and export .SVG format:
+```shell
+$ python linedraw.py -i input.jpg -o output.svg
+```
+Command specs:
+```
+usage: linedraw.py [-h] [-i [INPUT_PATH]] [-o [OUTPUT_PATH]] [-b] [-nc] [-nh]
+                   [--no_cv] [--hatch_size [HATCH_SIZE]]
+                   [--contour_simplify [CONTOUR_SIMPLIFY]]
+
+Convert image to vectorized line drawing for plotters.
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -i [INPUT_PATH], --input [INPUT_PATH]
+                        Input path
+  -o [OUTPUT_PATH], --output [OUTPUT_PATH]
+                        Output path.
+  -b, --show_bitmap     Display bitmap preview.
+  -nc, --no_contour     Don't draw contours.
+  -nh, --no_hatch       Disable hatching.
+  --no_cv               Don't use openCV.
+  --hatch_size [HATCH_SIZE]
+                        Patch size of hatches. eg. 8, 16, 32
+  --contour_simplify [CONTOUR_SIMPLIFY]
+                        Level of contour simplification. eg. 1, 2, 3
+```