update readme with usage instructions

README.md

@@ -1,6 +1,6 @@
 # rayoko
 
-a programming language
+a toy programming language and compiler
 
 this time it'll work i promise it wont be like vig plrease
 
@@ -11,3 +11,11 @@ git clone https://gitdab.com/luna/rayoko
 cd rayoko
 zig build install --prefix ~/.local/
 ```
+
+# use
+
+```
+rayoko examples/hello.ry # outputs to outpath.o
+gcc outpath.o examples/hello.c -o hello
+./hello
+```