Add justfile (#166)

justfile

@@ -0,0 +1,18 @@
+_default:
+    just --list
+
+# Run rustfmt and ensure the code meets the expectation of the checks in the CI
+format:
+    cargo +nightly fmt --all
+
+# Run basic checks similar to what the CI does to ensure your code is fine
+check:
+    cargo +nightly fmt --all -- --check
+    cargo +stable clippy --all-targets --all-features -- -D warnings
+
+# Run the tests
+test:
+    cargo test --all-features
+
+# So you are ready? This runs format, check and test
+ready: format check test