doc: Add Transport @macfja/pino-fingers-crossed (#2047)

docs/transports.md

@@ -426,6 +426,7 @@ PRs to this document are welcome for any new transports!
 + [pino-logfmt](#pino-logfmt)
 + [pino-telegram-webhook](#pino-telegram-webhook)
 + [pino-yc-transport](#pino-yc-transport)
++ [@macfja/pino-fingers-crossed](#macfja-pino-fingers-crossed)
 
 ### Legacy
 
@@ -1119,6 +1120,29 @@ logger.error(new Error("error"));
 logger.fatal("fatal");
 ```
 
+<a id="macfja-pino-fingers-crossed"></a>
+### @macfja/pino-fingers-crossed
+
+[@macfja/pino-fingers-crossed](https://github.com/MacFJA/js-pino-fingers-crossed) is a Pino v7+ transport that holds logs until a log level is reached, allowing to only have logs when it matters.
+
+```js
+const pino = require('pino');
+const { default: fingersCrossed, enable } = require('@macfja/pino-fingers-crossed')
+
+const logger = pino(fingersCrossed());
+
+logger.info('Will appear immedialty')
+logger.error('Will appear immedialty')
+
+logger.setBindings({ [enable]: 50 })
+logger.info('Will NOT appear immedialty')
+logger.info('Will NOT appear immedialty')
+logger.error('Will appear immedialty as well as the 2 previous messages') // error log are level 50
+logger.info('Will NOT appear')
+logger.info({ [enable]: false }, 'Will appear immedialty')
+logger.info('Will NOT appear')
+```
+
 <a id="communication-between-pino-and-transport"></a>
 ## Communication between Pino and Transports
 Here we discuss some technical details of how Pino communicates with its [worker threads](https://nodejs.org/api/worker_threads.html).