Update README build and and running instructions

README.md

@@ -9,8 +9,16 @@ This is experimental!
 GNU make is required.
 
 Run:
-```
-export PATH=/path/to/yk/ykcapi/scripts:${PATH}
+```shell
+export PATH=/path/to/yk/bin:${PATH} # local path to https://github.com/ykjit/yk/blob/master/bin/yk-config (yk needs to be compiled)
 export YK_BUILD_TYPE=<debug|release>
 make
 ```
+
+## Runinng
+
+```shell
+./src/lua -e "print('Hello World')" # execute program passed in as string
+./src/lua ./tests/utf8.lua # execute lua program file 
+./src/luac ./tests/utf8.lua -o ./utf8.out # translates lua programs into Lua bytecode
+```