Mention that we use rustfmt for code formatting

nickolay · nickolay · commit f82dc74e384e · 2019-05-06T22:20:29.000+03:00
...and add a `rustfmt.toml` as advised in https://www.reddit.com/r/rust/comments/9jl6a9/pro_tip_if_you_use_cargo_fmtrustfmt_use_a/
diff --git a/README.md b/README.md
@@ -51,3 +51,5 @@ This is a work in progress but I started some notes on [writing a custom SQL par
 ## Contributing
 
 Contributors are welcome! Please see the [current issues](https://github.com/andygrove/sqlparser-rs/issues) and feel free to file more!
+
+Please run [cargo fmt](https://github.com/rust-lang/rustfmt#on-the-stable-toolchain) to ensure the code is properly formatted.
diff --git a/rustfmt.toml b/rustfmt.toml
@@ -0,0 +1 @@
+# We use rustfmt's default settings to format the source code

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`@@ -0,0 +1 @@`
	`1`	`+# We use rustfmt's default settings to format the source code`