Add README's.

scripts/README.md

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+Testing Scripts
+===============
+
+Testing scripts written in Rhai.
+
+
+How to Run
+----------
+
+Compile the `rhai_runner` example:
+
+```bash
+cargo build --example rhai_runner
+```
+
+Run it:
+
+```bash
+./target/debug/examples/rhai_runner ./scripts/test_script_to_run.rhai
+```