Add initial README

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

README.md

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+# colorhash
+
+A tool for creating distinct art based on input data or hash.
+
+# Usage
+
+1. Clone the repository
+2. Run using `python -m colorhash -h` for usage.
+
+No dependencies required, everything is vanilla Python >=3.10.
+
+## Example usage
+
+### Create art using the default "nibble" art algorithm
+
+`python -m colorhash infile.dat -o out.svg`
+
+### Create art using the OpenSSH "randomart" art algorithm
+
+`python -m colorhash infile.dat -o out.svg -m randomart`
+
+### Create art using an MD5 hash instead of the default SHA512
+
+`python -m colorhash infile.dat -o out.svg -a md5`
+
+# Motivation
+
+Cryptographic hashes are often visually distinct, however, sometimes they are not. This can become
+vitally important in matters of security, when you are comparing two key hashes or verifying the
+checksum of a file from the internet. The goal of this project is to give more fuel for human
+pattern recognition so that two extremely similar hashes, maliciously crafted or not, have more
+visual depth to their distinction.
+
+This is not a perfect solution. [From OpenSSH sshkey.c](https://github.com/openssh/openssh-portable/blob/8054b906983ceaed01fabd8188d3dac24c05ba39/sshkey.c#L993):
+
+> If you see the picture is different, the key is different.
+> If the picture looks the same, you still know nothing.
+
+# Examples
+
+See the examples directory. TODO : make these into PNGs and embed them in this README file.