Add build script to copy README for rsdoc

src/build.rs

@@ -0,0 +1,16 @@
+use std::env::var;
+use std::error::Error;
+use std::fs::copy;
+use std::path::PathBuf;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let cwd = PathBuf::from(var("CARGO_MANIFEST_DIR").unwrap());
+    let root = cwd.parent().unwrap();
+    let readme = root.join("README.md");
+
+    if readme.exists() {
+        copy(root.join("README.md"), cwd.join("README.md"))?;
+    }
+
+    Ok(())
+}

src/lib.rs

@@ -1,4 +1,4 @@
-#![doc = include_str!("../README.md")]
+#![doc = include_str!("README.md")]
 
 mod inject;
 mod inject_keyed;