Added README.md

README.md

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+# Templest
+A single procedural macro to make temporary variables easier.
+Code example:
+```rs
+use templest::temp;
+
+fn main() {
+    let temp!() = 10;
+    
+    println!("{:?}", temp!(-));
+}
+```
+This code example prints `10` to the console.
+If we add a new temporary variable, after we define the first one as 10, and define that as 20, than 20 will be printed.
+```rs
+use templest::temp;
+
+fn main() {
+    let temp!() = 10;
+    let temp!() = 20;
+    
+    println!("{:?}", temp!(-));
+}
+```
+This new code example will print `20` to the console.