Update README

README.md

@@ -1 +1,18 @@
-docker run -ti --rm -v ~/code:/x -v /home/motiejus/.cache/zig:/home/motiejus/.cache/zig -w /x zig-repro sh -c 'useradd -ms /bin/bash motiejus && cd zig && su motiejus; bash'
+Building modern Zig from the original C++ implementation
+--------------------------------------------------------
+
+This repository explores building Zig from the C++ implementation without using
+binary blobs. [Forum post goes with this][1].
+
+```
+$ docker build -t zig-repro .
+$ docker run -ti --rm \
+    -v ~/code:/x \
+    -v /home/$USER/.cache/zig:/home/$USER/.cache/zig \
+    -w /x \
+    zig-repro 
+    sh -c "useradd -m -s /bin/bash $USER && cd zig && su $USER; bash"
+$ ../zig-repro/run
+```
+
+[1]: https://ziggit.dev/t/building-self-hosted-from-the-original-c-implementation/6607/11