Add sox and play commands for sox sound processing

pages/common/sox.md

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+# sox
+
+> SoX - Sound eXchange
+> Play, record and convert audio files
+> Audioformats are identified by extension
+
+- Merge two audio files into one
+
+`sox -m {{audiofile1}} {{audiofile2}} {{output_filename}}`
+
+- Trim an audio file to the specified time indecies
+
+`sox {{input_audiofile}} {{output_audiofile}} trim {{start}} {{end}}`
+
+- Normalize an audio file
+
+`sox --norm {{input_audiofile}} {{output_audiofile}}`
+
+- Reverse and save audio file
+
+`sox {{input_audiofile}} {{output_audiofile}} reverse`
+
+- Print statistical data of the audio file
+
+`sox {{audiofile}} -n stat`