usql: add page (#12275)

* usql: add page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/usql.md

@@ -0,0 +1,36 @@
+# usql
+
+> Universal CLI interface for SQL databases.
+> More information: <https://github.com/xo/usql>.
+
+- Connect to a specific database:
+
+`usql {{sqlserver|mysql|postgres|sqlite3|...}}://{{username}}:{{password}}@{{host}}:{{port}}/{{database_name}}`
+
+- Execute commands from a file:
+
+`usql --file={{path/to/query.sql}}`
+
+- Execute a specific SQL command:
+
+`usql --command="{{sql_command}}"`
+
+- List databases available on the server:
+
+`usql --list-databases`
+
+- Run an SQL command in the `usql` prompt:
+
+`{{prompt}}=> {{command}}`
+
+- Display the database schema:
+
+`{{prompt}}=> \d`
+
+- Export query results to a specific file:
+
+`{{prompt}}=> \g {{/path/to/results.txt}}`
+
+- Import data from a CSV file into a specific table:
+
+`{{prompt}}=> \copy {{/path/to/data.csv}} {{table_name}}`