Golang opentelemetry-go draft API (incomplete) (#9)

* Work in progress from https://github.com/lightstep/opentelemetry-golang-prototype

* Renames

* Rename

* Finish rename

* Rename packages

* README

exporter/stdout/stdout.go

@@ -0,0 +1,21 @@
+package stdout
+
+import (
+	"os"
+
+	"github.com/open-telemetry/opentelemetry-go/exporter/observer"
+	"github.com/open-telemetry/opentelemetry-go/exporter/reader"
+	"github.com/open-telemetry/opentelemetry-go/exporter/reader/format"
+)
+
+type (
+	stdoutLog struct{}
+)
+
+func New() observer.Observer {
+	return reader.NewReaderObserver(&stdoutLog{})
+}
+
+func (s *stdoutLog) Read(data reader.Event) {
+	os.Stdout.WriteString(format.EventToString(data))
+}