Document indentation argument on the front page

Took me a few minutes reading code to figure out how to do this
JuliaIO · Feb 14, 2018 · 0081227 · 0081227
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commit 0081227
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diff --git a/README.md b/README.md
@@ -47,6 +47,14 @@ JSON.print{T, N}(io::IO, v::Array{T, N})
 Writes a compact (no extra whitespace or indentation) JSON representation
 to the supplied IO.
 
+```julia
+JSON.print(a::Associative, indent)
+JSON.print(io::IO, a::Associative, indent)
+```
+
+Writes a JSON representation with newlines, and indentation if specified. Non-zero `indent` will be applied recursively to nested elements.
+
+
 ```julia
 json(a::Any)
 ```