build: add snap installation

I ( @boukendesho ) have volunteered to maintain the snap package so
this adds it back into the installation instructions.

It will set a `snap` tag visible in `rclone version` so we know where
it came from for support queries.

MAINTAINERS.md

@@ -19,6 +19,7 @@ Current active maintainers of rclone are:
 | wiserain         | @wiserain         | pikpak backend               |
 | albertony        | @albertony        |                              |
 | Chun-Hung Tseng  | @henrybear327     | Proton Drive Backend         |
+| Hideo Aoyama     | @boukendesho      | snap packaging               |
 
 **This is a work in progress Draft**
 

docs/content/install.md

@@ -290,6 +290,28 @@ docker run --rm \
 ls ~/data/mount
 kill %1
 ```
+## Snap installation {#snap}
+
+[![Get it from the Snap Store](https://snapcraft.io/static/images/badges/en/snap-store-black.svg)](https://snapcraft.io/rclone)
+
+Make sure you have [Snapd installed](https://snapcraft.io/docs/installing-snapd)
+
+```bash
+$ sudo snap install rclone
+```
+Due to the strict confinement of Snap, rclone snap cannot acess real /home/$USER/.config/rclone directory, default config path is as below.
+
+- Default config directory:
+    - /home/$USER/snap/rclone/current/.config/rclone
+
+Note: Due to the strict confinement of Snap, `rclone mount` feature is `not` supported.
+
+If mounting is wanted, either install a precompiled binary or enable the relevant option when [installing from source](#source).
+
+Note that this is controlled by [community maintainer](https://github.com/boukendesho/rclone-snap) not the rclone developers so it may be out of date. Its current version is as below.
+
+[![rclone](https://snapcraft.io/rclone/badge.svg)](https://snapcraft.io/rclone)
+
 
 ## Source installation {#source}
 

lib/buildinfo/snap.go

@@ -0,0 +1,8 @@
+//go:build snap
+// +build snap
+
+package buildinfo
+
+func init() {
+	Tags = append(Tags, "snap")
+}