Include flow diagram in README coderabbit created in other PR:

[fizyk]

Here's a comment with diagram:
fizyk/pyramid_fullauth#721 (comment)

sequenceDiagram
    autonumber
    participant Pytest as Pytest runner
    participant ProcFactory as postgresql_proc_factory
    participant PgServer as PostgreSQL process
    participant TemplateDB as Template DB (seeded)
    participant TestDB as Per-test DB (clone)

    Pytest->>ProcFactory: request postgresql_proc with load=[load_database]
    ProcFactory->>PgServer: start server
    ProcFactory->>TemplateDB: invoke load_database (create metadata, seed data)
    Note right of TemplateDB: Template is created and seeded once per full run
    loop per test
        Pytest->>PgServer: request clone of TemplateDB
        PgServer->>TestDB: create cloned database for test
        Pytest->>TestDB: run test using cloned DB
        Pytest->>TestDB: teardown: commit transaction
        Pytest->>TestDB: teardown: drop_all metadata (cleanup)
    end

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