move source to src/

README.md

@@ -7,6 +7,7 @@
 ## Build
 
 ```
+cd src/
 make
 ```
 

src/README.md

@@ -0,0 +1,6 @@
+# refactor v1
+
+I'm trying to split this up into multiple pieces but that probably involves using fewer global variables and passing the
+same data between the functions that use them.
+
+global variables will use `snake_case` and global constants will use `SCREAMING_SNAKE_CASE`.