Add docs about Snap (#569)

Author: lucacome

.github/workflows/ci.yml

@@ -134,7 +134,7 @@ jobs:
 
             - Use the {{version}} image from our [DockerHub](https://hub.docker.com/r/nginx/nginx-prometheus-exporter/tags?page=1&ordering=last_updated&name={{version-number}}), [GitHub Container](https://github.com/nginxinc/nginx-prometheus-exporter/pkgs/container/nginx-prometheus-exporter), [Amazon ECR Public Gallery](https://gallery.ecr.aws/nginx/nginx-prometheus-exporter) or [Quay.io](https://quay.io/repository/nginx/nginx-prometheus-exporter/tag/{{version-number}}?tab=tags).
             - Download the latest binaries from the [GitHub releases page](https://github.com/nginxinc/nginx-prometheus-exporter/releases/tag/{{version}}).
-            - Update to the latest version with `brew upgrade nginx-prometheus-exporter`.
+            - Update to the latest version with `brew upgrade nginx-prometheus-exporter` or `snap refresh nginx-prometheus-exporter`.
 
             ## Compatibility
 

README.md

@@ -6,6 +6,7 @@
 ![GitHub all releases](https://img.shields.io/github/downloads/nginxinc/nginx-prometheus-exporter/total?logo=github)
 ![GitHub release (latest by SemVer)](https://img.shields.io/github/downloads/nginxinc/nginx-prometheus-exporter/latest/total?sort=semver&logo=github)
 [![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/nginxinc/nginx-prometheus-exporter?logo=github&sort=semver)](https://github.com/nginxinc/nginx-prometheus-exporter/releases/latest)
+[![nginx-prometheus-exporter](https://snapcraft.io/nginx-prometheus-exporter/badge.svg)](https://snapcraft.io/nginx-prometheus-exporter)
 ![GitHub go.mod Go version](https://img.shields.io/github/go-mod/go-version/nginxinc/nginx-prometheus-exporter?logo=go)
 [![Docker Pulls](https://img.shields.io/docker/pulls/nginx/nginx-prometheus-exporter?logo=docker&logoColor=white)](https://hub.docker.com/r/nginx/nginx-prometheus-exporter)
 ![Docker Image Size (latest semver)](https://img.shields.io/docker/image-size/nginx/nginx-prometheus-exporter?logo=docker&logoColor=white&sort=semver)
@@ -399,8 +400,7 @@ useful for experimenting with new features that are not yet published in a stabl
 
 ### Binaries
 
-We publish the binaries for multiple Operating Systems and architectures on the GitHub [releases
-page](https://github.com/nginxinc/nginx-prometheus-exporter/releases).
+We publish the binaries for multiple Operating Systems and architectures on the GitHub [releases page](https://github.com/nginxinc/nginx-prometheus-exporter/releases).
 
 ### Homebrew
 
@@ -416,6 +416,14 @@ and then install the formula with
 brew install nginx-prometheus-exporter
 ```
 
+### Snap
+
+You can install the NGINX Prometheus Exporter from the [Snap Store](https://snapcraft.io/nginx-prometheus-exporter).
+
+```console
+snap install nginx-prometheus-exporter
+```
+
 ## Building the Exporter
 
 You can build the exporter using the provided Makefile. Before building the exporter, make sure the following software