README.md: Add some example code

README.md

@@ -98,10 +98,31 @@ defmodule Foo do
 end
 ```
 
+---
+
 #### `CredoContrib.Check.EmptyDocString`
 
 Disallows `@doc` strings that do not contain any text.
 
+```elixir
+## GOOD
+
+@doc """
+This is a function
+"""
+def bar do
+  :ok
+end
+
+## BAD
+
+@doc """
+"""
+def bar do
+  :ok
+end
+```
+
 ---
 
 #### `CredoContrib.Check.EmptyTestBlock`
@@ -110,6 +131,21 @@ Disallows usage of [ExUnit.Case.test/3][test-3] with an empty body.
 
 For unimplemented tests, use [ExUnit.Case.test/1][test-1] and set `ExUnit.start(except: [:not_implemented])`
 
+```elixir
+## GOOD
+
+test "something not implemented"
+
+test "something implemented" do
+  assert 1 + 1 == 2
+end
+
+## BAD
+
+test "something not implemented" do
+end
+```
+
 [test-1]: https://hexdocs.pm/ex_unit/ExUnit.Case.html#test/1
 [test-3]: https://hexdocs.pm/ex_unit/ExUnit.Case.html#test/3