dict: add page (#6283)

pages/common/dict.md

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+# dict
+
+> Command line dictionary using the DICT protocol.
+> More information: <https://github.com/cheusov/dictd>.
+
+- List available databases:
+
+`dict -D`
+
+- Get information about a database:
+
+`dict -i {{database_name}}`
+
+- Look up a word in a specific database:
+
+`dict -d {{database_name}} {{word}}`
+
+- Look up a word in all available databases:
+
+`dict {{word}}`
+
+- Show information about the DICT server:
+
+`dict -I`