docs: adding skeleton README.md files for all vlib modules (#13034)

vlib/sqlite/README.md

@@ -1,5 +1,14 @@
+## Description:
+
+`sqlite` is a thin wrapper for [the SQLite library](https://sqlite.org/), which in turn is
+"a C-language library that implements a small, fast, self-contained,
+high-reliability, full-featured, SQL database engine."
+
 # Install SQLite Dependency
 
+Before you can use this module, you must first have the SQLite development
+library installed on your system.
+
 **Fedora 31**:
 
 `sudo dnf -y install sqlite-devel`