tailscale-up: add page (#6513)

pages/common/tailscale-up.md

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+# tailscale up
+
+> Connects the client to the Tailscale network.
+> In version 1.8 and above, command line arguments are stored and reused until they're overwritten or `--reset` is called.
+> More information: <https://tailscale.com/kb/admin/>.
+
+- Connect to Tailscale:
+
+`sudo tailscale up`
+
+- Connect and offer the current machine to be an exit node for internet traffic:
+
+`sudo tailscale up --advertise-exit-node`
+
+- Connect using a specific node for internet traffic:
+
+`sudo tailscale up --exit-node={{exit_node_ip}}`
+
+- Connect and block incoming connections to the current node:
+
+`sudo tailscale up --shields-up`
+
+- Connect and don't accept DNS configuration from the admin panel (defaults to `true`):
+
+`sudo tailscale up --accept-dns={{false}}`
+
+- Connect and configure Tailscale as a subnet router:
+
+`sudo tailscale up --advertise-routes={{10.0.0.0/24}},{{10.0.1.0/24}}`
+
+- Connect and accept subnet routes from Tailscale:
+
+`sudo tailscale up --accept-routes`
+
+- Reset unspecified settings to their default values and connect:
+
+`sudo tailscale up --reset`