contrib: Captive portal for wlan-ap (#453)

* Create install-nodogsplash.sh

* Create nodogsplash.conf

* Update install-nodogsplash.sh

* Create README.md

* Clean up

contrib/captive-portal/README.md

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+# NoDogSplash captive portal
+
+Source: https://github.com/nodogsplash/nodogsplash
+
+Nodogsplash is a Captive Portal that offers a simple way to provide restricted access to the Internet by showing a splash page to the user before Internet access is granted.
+
+This script install and configured the Nodogsplash captive portal to run on `wlan-ap` interface of the prototype stack.
+
+## Installation
+
+```
+chmod +x install-nodogsplash.sh
+./install-nodogsplash.sh
+```
+
+## Issues
+
+Some people have objections using captive portal because it hijacks traffic and could potentially be a privacy violation. Additionally it prevents headless devices from accessing the internet.
+
+## Nice to have
+
+- [ ] Nice tomesh splash screen (/etc/nodogsplash/htdocs/splash.sh)

contrib/captive-portal/install-nodogsplash.sh

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+#!/bin/bash
+
+sudo apt install -y libmicrohttpd-dev
+
+mkdir tmp
+cd tmp
+git clone https://github.com/nodogsplash/nodogsplash.git
+cd nodogsplash
+make
+sudo make install
+sudo cp debian/nodogsplash.service /etc/systemd/system
+cd ..
+cd ..
+rm -rf tmp
+
+cp nodogsplash.conf /etc/nodogsplash/nodogsplash.conf
+sudo systemctl enable nodogsplash
+sudo systemctl start nodogsplash

contrib/captive-portal/nodogsplash.conf

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+GatewayInterface wlan-ap
+#login_option_enabled 1
+FirewallRuleSet authenticated-users {
+  FirewallRule allow all
+}
+FirewallRuleSet preauthenticated-users {
+#  FirewallRule allow tcp port 80 to 123.321.123.321
+}
+FirewallRuleSet users-to-router {
+    FirewallRule allow udp port 53
+    FirewallRule allow tcp port 53
+    FirewallRule allow udp port 67
+   FirewallRule allow tcp port 22
+#   FirewallRule allow tcp port 80
+#   FirewallRule allow tcp port 443
+}
+GatewayName ToMeshNode
+GatewayAddress 10.0.0.1   
+GatewayPort 2050
+MaxClients 250
+AuthIdleTimeout 480