Fix warning and add README

README.md

@@ -1,2 +1,18 @@
 # lasy-cli
 
+# How to install
+
+1. Visit https://rustup.rs/ and follow instructions to install Rust
+2. Run: `$ cargo install --git https://git.interhacker.space/lle-bout/lasy-cli.git --force`
+
+# How to use
+
+For example with <https://git.interhacker.space/teamlaser/LJ>:
+
+`$ python clitools/generators/tunnel.py | clitools/filters/kaleidoscope.py | lasy-cli`
+
+And it will print optimized points in the same format.
+
+# How to update with latest changes from this repo
+
+Re-run step 2 of installation