flac: add page

pages/common/flac.md

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+# flac
+
+> Encodes, decodes and tests flac files.
+
+
+- Encode a wav file to flac, writing to /path/to/file.flac:
+
+`flac {{/path/to/file.wav}}`
+
+- Decode a flac file to wav, specifying the output file:
+
+`flac -d --output-name {{/path/to/output.wav}} {{/path/to/input.flac}}`
+
+- Test a flac file:
+
+`flac -t {{/path/to/file.flac}}`