Implement dedent proc_macro

readme.md

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+# dedent
+
+A procedural macro that removes leading indentation from string literals.
+
+```toml
+[dependencies]
+dedent = { version = "0.1", registry = "nettika" }
+```
+
+## Example
+
+```rust
+use dedent::dedent;
+
+let xml = dedent! {r#"
+    <root>
+        <item id="3"/>
+    </root>
+"#};
+
+assert_eq!(xml, r#"<root>
+    <item id="3"/>
+</root>"#);
+```