Add more content to the README file

Author: barweiss

README.md

@@ -54,3 +54,34 @@ func printValues(a int, b string) {
 tup := tuple.New2(5, "hi!")
 a, b := tup.Values()
 ```
+
+## Formatting
+
+Tuples implement the `Stringer` and `GoStringer` interfaces.
+
+```go
+fmt.Println("%s", tuple.New2("hello", "world"))
+// Output:
+// ["hello" "world"]
+
+fmt.Println("%#v", tuple.New2("hello", "world"))
+// Output:
+// tuple.T2[string, string]{V1: "hello", V2: "world"}
+```
+
+# Notes
+
+The tuples code and test code are generated by the `scripts/gen/main.go` script.
+
+The generation works by reading `tuple.tpl` and `tuple_test.tpl` using Go's `text/template` engine.
+`tuple.tpl` and `tuple_test.tpl` detail the templated content of a generic tuple class, with variable number of elements.
+
+# Contributing
+
+Please feel free to contribute to this project by opening issues or creating pull-requests.
+However, keep in mind that generic type features for Go are still in their early stages, so there might
+not be support from the language to your requested feature.
+
+Also keep in mind when contributing to keep the compilation time and performance of this package fast.
+
+Feel free to contact me at [[email protected]](mailto:[email protected]) for questions or suggestions!