sqlite3: add page (#1420)

pages/common/sqlite3.md

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+# sqlite3
+
+> The command-line interface to SQLite 3, which is a self-contained file-based embedded SQL engine.
+
+- Start an interactive shell with a new database:
+
+`sqlite3`
+
+- Open an interactive shell against an existing database:
+
+`sqlite3 {{path/to/database.sqlite3}}`
+
+- Execute an SQL statement against a database and then exit:
+
+`sqlite3 {{path/to/database.sqlite3}} '{{SELECT * FROM some_table;}}'`