DOC-6268 infra to map command names to client API calls and display in docs

build/command-api-mapping-README.md

@@ -0,0 +1,49 @@
+# Command API Mapping
+
+The `data/command-api-mapping/` directory contains individual JSON files mapping Redis commands to their client library method signatures.
+
+## Structure
+
+Each file is named after a Redis command (e.g., `GET.json`, `SET.json`, `BF.ADD.json`) and contains the API mappings for that command:
+
+```json
+{
+  "api_calls": {
+    "redis_py": [...],
+    "jedis": [...],
+    "lettuce_sync": [...],
+    "lettuce_async": [...],
+    "lettuce_reactive": [...],
+    "go-redis": [...],
+    "node_redis": [...],
+    "ioredis": [...],
+    "redis_rs_sync": [...],
+    "redis_rs_async": [...],
+    "nredisstack_sync": [...],
+    "nredisstack_async": [...],
+    "php": [...]
+  }
+}
+```
+
+## Adding a New Command
+
+1. Create a new file named `data/command-api-mapping/COMMAND_NAME.json` (e.g., `MGET.json`)
+2. Add the `api_calls` structure with method signatures for each client
+3. Run the merge script to generate the combined output
+
+## Merging Files
+
+To combine all individual files into a single `command-api-mapping.json`:
+
+```bash
+./build/merge-command-api-mapping.sh                      # Output to data/command-api-mapping.json
+./build/merge-command-api-mapping.sh /path/to/output.json # Output to custom location
+```
+
+## Files
+
+- `data/command-api-mapping/*.json` - Individual command mapping files (273 commands)
+- `build/merge-command-api-mapping.sh` - Script to combine all files into a single JSON
+- `build/command-api-mapping-README.md` - This file
+