frp, frpc, frps: add page (#12945)

Co-authored-by: spageektti <git@spageektti.cc>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Vítor Henrique <87824454+vitorhcl@users.noreply.github.com>

pages/common/frp.md

@@ -0,0 +1,12 @@
+# frp
+
+> Fast Reverse Proxy: quickly set up network tunnels to expose certain services to the Internet or other external networks.
+> More information: <https://github.com/fatedier/frp>.
+
+- View documentation for `frpc`, the `frp` client component:
+
+`tldr frpc`
+
+- View documentation for `frps`, the `frp` server component:
+
+`tldr frps`