Merge pull request #442 from dylanrees/master

Added file.md to common

pages/common/file.md

@@ -0,0 +1,11 @@
+# file
+
+> Determine file type
+
+- Give a description of the type of the specified file.  Works fine for files with no file extension.
+
+`file {{filename}}`
+
+- Look inside a zipped file and determine the file type(s) inside
+
+`file -z {{foo.zip}}`