Merge in the Release-Plz Setup (#6)

This Pull Request will setup the process of Automatic release of everything in the workspace.

Adds in a README.md file.

---------

Co-authored-by: ci-bot <bot@email.melfely.com>
Reviewed-on: #6
Co-authored-by: Melfely <bug362@outlook.com>

example_lib/src/lib.rs

@@ -2,6 +2,10 @@ pub fn add(left: u64, right: u64) -> u64 {
     left + right
 }
 
+pub fn sub(left: u64, right: u64) -> u64 {
+    left - right
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -10,5 +14,7 @@ mod tests {
     fn it_works() {
         let result = add(2, 2);
         assert_eq!(result, 4);
+        let result = sub(2, 2);
+        assert_eq!(result, 0);
     }
 }