2016: add "Prototype your Design!" talk (dotGo 2016)

Change-Id: I65acb219bf9551ef4300af221223d9469be7a382
Reviewed-on: https://go-review.googlesource.com/32573
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/2016/prototype-your-design.pdf b/2016/prototype-your-design.pdf
new file mode 100644
index 0000000..469ce3e
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