chore: grpc draft

docs/pages/docs/features/grpc/index.md

+---
+collections:
+    - documents
+draft: true
+layout: dm:document
+parent: docs/features/index
+title: gRPC
+description: >
+    Use gRPC for remote procedure calls and interoperability.
+---
+
+# gRPC
+
+# Installation
+
+You can find instruction on the official 
+[Google documentation page](https://cloud.google.com/php/grpc).
+
+On Debian-based systems:
+
+```shell
+$ sudo apt install autoconf zlib1g-dev php-dev php-pear
+$ sudo pecl install grpc
+$ sudo pecl install protobuf
+```
+
+#  Usage