feat: toy tutorial chapter 2.

examples/multiply_transpose.hello

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+# User defined generic function that operates on unknown shaped arguments.
+def multiply_transpose(a, b) {
+  return transpose(a) * transpose(b);
+}
+
+def main() {
+  # Define a variable `a` with shape <2, 3>, initialized with the literal value.
+  var a = [[1, 2, 3], [4, 5, 6]];
+  var b<2, 3> = [1, 2, 3, 4, 5, 6];
+
+  # This call will specialize `multiply_transpose` with <2, 3> for both
+  # arguments and deduce a return type of <3, 2> in initialization of `c`.
+  var c = multiply_transpose(a, b);
+
+  # A second call to `multiply_transpose` with <2, 3> for both arguments will
+  # reuse the previously specialized and inferred version and return <3, 2>.
+  var d = multiply_transpose(b, a);
+
+  # A new call with <3, 2> (instead of <2, 3>) for both dimensions will
+  # trigger another specialization of `multiply_transpose`.
+  var e = multiply_transpose(c, d);
+
+  # Finally, calling into `multiply_transpose` with incompatible shapes
+  # (<2, 3> and <3, 2>) will trigger a shape inference error.
+  var f = multiply_transpose(a, c);
+}