docs: mention Lambda layer with LibreOffice

Author: vladgolubev

README.md

@@ -49,6 +49,7 @@ Compiled and ready to use archive can be downloaded under [Releases section](htt
 
 * [Docker in AWS Lambda](https://github.com/vladgolubev/docker-in-aws-lambda)
 * [NPM package with bundled LibreOffice for Lambda (85 MB)](https://github.com/shelfio/aws-lambda-libreoffice)
+* [Lambda Layer with LibreOffice](https://github.com/shelfio/libreoffice-lambda-layer)
 
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