Add README

README.md

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+# Wavefunction Collapse
+
+This is the example code for my blog post,
+"The Wavefunction Collapse Algorithm explained
+very clearly". To install dependencies:
+
+```
+virtualenv vendor
+source vendor/bin/active
+pip install -r requirements.txt
+```
+
+Then to run:
+
+```
+python main.py
+```
+
+You will get a nice picture of a coastline.
+
+![WFC Example](example.png)