cleanup & fix ci (#82)

* cleanup readme & examples
* upgrade go version
* add makefile with basic commands
* add e2e test
* add gha
* update .gitignore

transcoder/progress.go

@@ -0,0 +1,9 @@
+package transcoder
+
+type Progress struct {
+	FramesProcessed string
+	CurrentTime     string
+	CurrentBitrate  string
+	Progress        float64
+	Speed           string
+}