feat: bootstrap viexp crate with lib/bin split and sanity test (#1)

src/lib.rs

@@ -0,0 +1,11 @@
+pub fn run() {
+    print!("viexp {}", env!("CARGO_PKG_VERSION"));
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn sanity() {
+        assert_eq!(2 + 2, 4);
+    }
+}

src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    viexp::run()
+}