Revise README to reflect project status change

Merge pull request #4 from devscast/dependabot/composer/league/commonmark-2.7.0

feat(vector-store): mariadb and postgres support fixes

build(deps-dev): bump league/commonmark from 2.6.2 to 2.7.0

feat: support doctrine vector stores

remove unsuded deps

fix: document's vector creation

ref: docs and tests

fix json serialization

ref: make tools optional

feat: introduction completion chat and RAG chat

feat: add default implementation for embedding generation

feat: add support for deepseek ai

feat: support array for ToolParameter

docs: add example for tools calling