Create RAMDOM_MAC.md

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+# Privacy & Random MAC's
+<!--- --------------------------------------------------------------------- --->
+
+The latest versions of some operating systems (IOS and Android) incorporate a
+new & interesting functionality to improve privacy: **Random MACs**.
+
+This functionality allows you to **hide the true MAC** of the device and
+**assign a random MAC** when we connect to WIFI networks.
+
+This behavior is especially useful when connecting to WIFI's that we do not
+know, but it **is totally useless when connecting to our own WIFI's** or known
+networks.
+
+**I recommend disabling this operation when connecting our devices to our own
+WIFI's**, in this way, Pi.Alert will be able to identify the device, and it
+will not identify it as a new device every so often (every time IOS or Android
+decides to change the MAC).
+
+### IOS
+![ios][ios]
+
+  - [Use private Wi-Fi addresses in iOS 14](https://support.apple.com/en-us/HT211227)
+
+### Android
+![Android][Android]
+
+  - [How to Disable MAC Randomization in Android 10](https://support.boingo.com/s/article/How-to-Disable-MAC-Randomization-in-Android-10-Android-Q)
+  - [How do I disable random Wi-Fi MAC address on Android 10](https://support.plume.com/hc/en-gb/articles/360052070714-How-do-I-disable-random-Wi-Fi-MAC-address-on-Android-10-)
+  
+<!--- --------------------------------------------------------------------- --->
+[ios]: https://9to5mac.com/wp-content/uploads/sites/6/2020/08/how-to-use-private-wifi-mac-address-iphone-ipad.png?resize=2048,1009 "ios"
+[Android]: doc/img/android_random_mac.png "Android"
+