Add 'go-cheatsheet.md'

go-cheatsheet.md

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+# go (golang) cheatsheet
+
+## testing
+
+``` go
+t.Logf("%#v", eim)
+```
+
+Outputs types with keys, viz:
+
+```
+    inner_test.go:17: &message.InnerMessage{
+        ours:(*message.InnerJSONStruct)(nil),
+        dstPubKey:(*cbk.CryptoBoxKey)(nil),
+        srcPrivKey:(*cbk.CryptoBoxKey)(nil)}
+```