Added readme

Readme.md

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+# SDF Tool
+
+*A signed distance fields-based tool to generate shadow transition maps*
+
+## Key features
+
+- float16 png output for reduced banding
+- Automatic CUDA/OpenCL GPU Acceleration for most of the process
+- *nix style command line interface
+
+## How to use:
+From command line: `SDFMapTool -D <directory_with_images> -i <image1.png;image2.png;...> -o <output_file_path.png> ...`
+
+Available options:
+
+```terminal
+
+  -d, --debug           Enable debug mode.
+
+  -D, --imgDirectory    Required. Input Images directory.
+
+  -i, --images          Required. Images file names separated by ';' and in the correct order.
+
+  -o, --output          Required. Output file path.
+
+  -b, --blur            How many blur iterations to run.
+
+  -r, --radius          Blur radius.
+
+  -s, --step            Blur step size.
+
+  --sigma               Blur sigma value (weighting).
+
+  --help                Display this help screen.
+
+  --version             Display version information.
+
+```