ngrok: add page (#3003)

pages/common/ngrok.md

@@ -0,0 +1,24 @@
+# ngrok
+
+> Reverse proxy that creates a secure tunnel from a public endpoint to a locally running web service.
+> Homepage: <https://ngrok.com>.
+
+- Expose a local HTTP service on a given port:
+
+`ngrok http {{80}}`
+
+- Expose a local HTTP service on a specific host:
+
+`ngrok http {{foo.dev}}:{{80}}`
+
+- Expose a local HTTPS server:
+
+`ngrok http https://localhost`
+
+- Expose TCP traffic on a given port:
+
+`ngrok tcp {{22}}`
+
+- Expose TLS traffic for a specific host and port:
+
+`ngrok tls -hostname={{foo.com}} {{443}}`