Added readme description

README.md

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+# Anti Captive Portals
+
+Bypass captive portals and get free WiFi easy 😝
+
+To build
+```
+./build.sh
+```
+
+To run
+```
+cd build
+./anticap
+```
+
+Use `-h` flag to get more help on different options. Use `-v` to show log output.
+
+## What does this tool do exactly?
+
+1. Capture packets in monitor mode for a given WiFi network
+2. Go through the list of discover devices and try to access internet
+3. Derive some connection rating based on the previous step
+4. Pick a device with the best connection and set your mac address to this device
+
+This tool is tested on Mojave 10.14.2 with
+Card Type:	AirPort Extreme  (0x14E4, 0x133)
+Firmware Version:	Broadcom BCM43xx 1.0 (7.77.61.1 AirPortDriverBrcmNIC-1305.2)
+
+Special thanks for people developing following tools
+
+- https://github.com/feross/SpoofMAC
+- https://github.com/unixpickle/JamWiFi