Updating README description of project

Also updated the GitHub project description to:
"Learn the Zig programming language by fixing tiny broken programs."

I think it sounds more of a fun challenge this way rather than the more
academic "learn by doing exercises".

I mean, who wouldn't want to come help these "tiny broken programs"?!?

README.md

@@ -1,9 +1,9 @@
 # ziglings
 
-Welcome to `ziglings`! This project contains a series of incomplete exercises.
-By completing the exercises, you learn how to read and write
+Welcome to `ziglings`! This project contains a series of tiny broken programs.
+By fixing them, you'll learn how to read and write
 [Zig](https://ziglang.org/)
-code.
+code!
 
 This project was directly inspired by the brilliant and fun
 [rustlings](https://github.com/rust-lang/rustlings)