ws4sqlite -> ws4sql transition document

Author: proofrock

ROADMAP.md

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+The next version of `ws4sqlite` will be called `ws4sql`, because it will support more RDBMs than sqlite.
+
+The version in this branch is a work in progress to slowly add features and (unfortunately) breaking changes; here is a review of what changed compared to `ws4sqlite` "stable" + a migration path.
+
+# Changes
+
+- SQLite is embedded via [mattn/go-sqlite3](https://github.com/mattn/go-sqlite3) and CGO. Should be way faster.
+- Target platforms (because of CGO) are now 6 (`win/amd64`, `macos/amd64`, `macos/arm64`, `linux/amd64`, `linux/arm64`, `linux/arm6`)
+
+# Migration
+
+- Nothing needed for now :-)
+
+# Roadmap
+
+1. Make it mandatory to use conf files for databases
+1. Support duckdb (and iron out all the incompatibilities)
+1. Support mariadb/mysql
+1. Support postgresql
+1. ...
+1. Profit!