Create README.md

README.md

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+# Rust bindings for RV
+Safe bindings for the [RV](https://github.com/mnurzia/rv).
+
+# Example
+```rust
+use rsrv::rv::*;
+
+fn main() {
+    let cpu = RV::new(0x10000, vec![0x02A88893, 0x00000073]);
+
+    while RV::step(cpu) != RV_EECALL {}
+
+    println!(
+        "Environment call @ {:08x}: {}",
+        RV::get_pc(cpu),
+        RV::get_r(cpu)[17]
+    );
+}
+```