Add mdfind

pages/osx/mdfind.md

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+# mdfind
+
+> List files matching a query
+
+- Find a file named **"Inception"**
+
+`mdfind -name inception`
+
+- Find a file containing **"football"**
+
+`mdfind football`
+
+- Find a file containing **"football"**, in the directory **"~/Documents"**
+
+`mdfind -onlyin ~/Documents football`