docs: add gvisor page

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+# gVisor
+
+[gVisor](https://github.com/google/gvisor) is a user-space kernel, written in
+Go, that implements a substantial portion of the Linux system surface.
+
+`gVisor` uses `linux` OS, but the special `gvisor` VM type. There is nothing
+special regarding `gVisor` besides that. Here is an example manager config:
+
+```
+{
+	"name": "gvisor",
+	"target": "linux/amd64",
+	"http": ":12345",
+	"workdir": "/workdir",
+	"image": "/usr/local/bin/runsc",
+	"vmlinux": "/usr/local/bin/runsc",
+	"syzkaller": "/gopath/src/github.com/google/syzkaller",
+	"cover": false,
+	"procs": 8,
+	"type": "gvisor",
+	"vm": {
+		"count": 5,
+		"runsc_args": "-platform=kvm"
+	}
+}
+```