keepass2: add page (#1394)

pages/common/keepass2.md

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+# keepass2
+
+> A light-weight password manager.
+
+- Start KeePass 2, opening the most recently-opened password database:
+
+`keepass2`
+
+- Start KeePass 2, opening a specific password database:
+
+`keepass2 {{path/to/database.kbdx}}`
+
+- Use a specific key file to open a password database:
+
+`keepass2 {{path/to/database.kbdx}} -keyfile:{{path/to/key/file.key}}`