Initial project import

tools/v/vlib/db/README.md

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+## Description
+
+`db` is a namespace that contains several useful modules 
+for operating with databases (SQLite, MySQL, MSQL, etc.)
+
+## Cross-driver consistency helpers
+
+`db.pg` and `db.mysql` accept both `user` and `username` in their `Config` structs.
+
+`db.pg`, `db.mysql`, and `db.sqlite` rows expose `row.val(index)` and `row.values()`
+for direct string access. In `db.pg`, SQL `NULL` remains available through
+`row.val_opt(index)`.
+
+`db.pg`, `db.mysql`, and `db.sqlite` also expose `exec_param2(...)` as a convenience
+wrapper around their parameterized query helpers.