Add Doltlite (embedded database) (#1850)

Author: toge

README.md

@@ -459,6 +459,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 
 * [ClickHouse](https://github.com/ClickHouse/clickhouse-cpp) - C++ client for ClickHouse DBMS. [Apache2]
 * [CrossDB](https://github.com/crossdb-org/crossdb) - Ultra High-performance Lightweight Embedded and Server OLTP RDBMS. [MPL-2.0] [website](https://crossdb.org/)
+* [Doltlite](https://github.com/dolthub/doltlite) - Version Controlled SQLite. [PublicDomain/Apache2]
 * [DuckDB](https://duckdb.org/) - in-process SQL OLAP Database Management System. [MIT] [website](https://duckdb.org/)
 * [hiberlite](https://github.com/paulftw/hiberlite) - C++ Object-relational mapping for sqlite3. [BSD]
 * [Hiredis](https://github.com/redis/hiredis) - A minimalistic C client library for the Redis database. [BSD]