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Update README.md

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SunFounder/SmartVideoCar/README.md
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5. Now you can ping 192.168.1.10 and hopefully you can connect to it (for the debugging purpose)
# Setup wireless networks
Run `sudo nano /etc/hostapd/hostapd.conf` and use the following as an example
```
interface=wlan0
#driver=nl80211
bssid=b8:27:eb:98:8c:a7 # specify mac address of the usb wifi
ssid=Pi_AP-1c54 # name of wifi
country_code=US
hw_mode=g
channel=11
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=Raspberry
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP
wpa_group_rekey=86400
ieee80211n=1
wme_enabled=1
```
# Setup monitor mode of wifi card
1. Check with `iw dev` which interface to use, in our case `wlan0` on `phy0` is what we want
2. Double check if `iw phy phy0 info` returns `monitor` in `Supported interface modes`
1. Check with `iw dev` which interface to use, in our case `wlan1` on `phy1` is what we want
2. Double check if `iw phy phy1 info` returns `monitor` in `Supported interface modes`
3. Do the following
```
sudo iw phy phy0 interface add mon0 type monitor
sudo iw dev wlan0 del
sudo ifconfig mon0 up
sudo iw dev mon0 set freq 2437
iwconfig mon0
sudo iw phy phy1 interface add mon1 type monitor
sudo iw dev wlan1 del
sudo ifconfig mon1 up
sudo iw dev mon1 set freq 2437
iwconfig mon1
```
# Capture RSS signal of, e.g., sandlab wireless network
```sudo tcpdump -i mon0 -n -tttt | grep sandlab | awk '{print $8}'```
```sudo tcpdump -i mon1 -n -tttt | grep sandlab | awk '{print $8}'```