Adding note about skipping mypy for targets. (#11)

Co-authored-by: Mark Elliot <123787712+mark-thm@users.noreply.github.com>

readme.md

@@ -112,3 +112,17 @@ mypy_cli(
     ],
 )
 ```
+
+## Skipping Targets
+Adding the `no-mypy` tag will elide type checking for that target. This is useful for targets outside of your
+control that generate py_* rules, such as `compile_pip_requirements` or `py_console_script_binary`, and modules
+that still need typing.
+
+For example:
+```starlark
+py_binary(
+    name = "no_types_yet_bin",
+    srcs = ["no_types_yet_main.py"],
+    tags = ["no-mypy"],
+)
+```