feat: toy tutorial chapter 1.

examples/transpose.hello

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+def main() {
+  # Define a variable `a` with shape <2, 3>, initialized with the literal value.
+  # The shape is inferred from the supplied literal.
+  var a = [[1, 2, 3], [4, 5, 6]];
+
+  # b is identical to a, the literal tensor is implicitly reshaped: defining new
+  # variables is the way to reshape tensors (element count must match).
+  var b<2, 3> = [1, 2, 3, 4, 5, 6];
+
+  # transpose() and print() are the only builtin, the following will transpose
+  # a and b and perform an element-wise multiplication before printing the result.
+  print(transpose(a) * transpose(b));
+}