Add docstring to at-enumx macro, closes #2.

src/EnumX.jl

@@ -8,6 +8,28 @@ abstract type Enum{T} <: Base.Enum{T} end
 
 @noinline panic(x) = throw(ArgumentError(x))
 
+"""
+    @enumx
+
+Macro for generating an enum type with instances.
+
+`@enumx` can be used as a drop in replacement for `@enum` from `Base`, but have several
+improvements. See the [README](https://github.com/fredrikekre/EnumX.jl) or the module
+docstring (`?EnumX` in the REPL) for more details.
+
+# Examples
+```julia
+julia> @enumx Fruit Apple Banana
+
+julia> Fruit.T
+Enum type Fruit.T <: Enum{Int32} with 2 instances:
+ Fruit.Apple  = 0
+ Fruit.Banana = 1
+
+julia> Fruit.Apple
+Fruit.Apple = 0
+```
+"""
 macro enumx(args...)
     return enumx(__module__, Any[args...])
 end