Add simple use example

doc/Language/101-basics.rakudoc

@@ -461,6 +461,34 @@ say "we have @flavors.sort.join(', ')";
                                   # OUTPUT: «we have peach, vanilla␤»
 =end code
 
+=head1 Calling a raku method from another file
+
+To call a raku subroutine from another file, the convention is to have a minimal
+raku module or class file.
+
+=begin code
+# MyClass.rakumod  
+class C {
+    has $.x;
+}
+=end code
+
+Then your script can use this file.
+
+=begin code
+# myscript.raku
+use MyClass;
+
+my $instance = C.new(x=>42);
+say $instance.x;
+=end code
+
+The C<-I.> directive tells the raku interpreter to look in directory C<.>.
+
+=begin code
+> raku -I. myscript.raku
+=end code
+
 =head1 Exercises
 
 B<1.> The input format of the example program is redundant: the first line