docs: list openvgdb and emuready providers in readme and env example

Author: DevYukine

.env.example

@@ -37,6 +37,18 @@ MOBYGAMES_API_KEY=YOUR_MOBYGAMES_API_KEY
 # exposed by playmatch for this provider.
 # EMUREADY_ENABLED=true
 
+# OpenVGDB is a bulk metadata source distributed as a small SQLite snapshot
+# (~9 MB zip). Setting OPENVGDB_ENABLED=true enables a daily download of the
+# OpenVGDB release zip and the import of its ROMs and RELEASES tables into
+# local Postgres tables. Matching is hash-first (CRC, MD5, SHA1) against the
+# imported tables; no calls leave the box at match time. The dataset is
+# updated infrequently upstream, so the md5-skip check normally short-circuits
+# subsequent imports at no cost.
+# OPENVGDB_ENABLED=true
+# Optional override for the release zip URL. Defaults to the GitHub latest
+# release asset when omitted.
+# OPENVGDB_METADATA_URL=https://github.com/OpenVGDB/OpenVGDB/releases/latest/download/openvgdb.zip
+
 # Pepper used for HMAC-SHA256 hashing of API keys. Generate with `openssl rand -hex 32`.
 # Must be at least 16 raw bytes (32 hex chars). Treat like a production secret.
 API_KEY_PEPPER=REPLACE_WITH_OUTPUT_OF_openssl_rand_hex_32

README.md

@@ -26,6 +26,8 @@ The public API is available at [playmatch.retrorealm.dev](https://playmatch.retr
 - [x] Support for ScreenScraper as metadata provider
 - [x] Support for MobyGames as metadata provider
 - [x] Support for LaunchBox as metadata provider (bulk metadata import, opt-in via `LAUNCHBOX_ENABLED`)
+- [x] Support for OpenVGDB as metadata provider (offline SQLite hash matching, opt-in via `OPENVGDB_ENABLED`)
+- [x] Support for EmuReady as metadata provider (id-mapping only, opt-in via `EMUREADY_ENABLED`)
 
 ### Planned