docs: add readme file

Author: Timandes

README.md

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+# MAC Address Device Tracker
+
+MAC address device tracker for Home Assistant. Most codes are derived from [@mudape's iPhone Detect](https://github.com/mudape/iphonedetect).
+
+## Installation
+
+### Git clone from GitHub
+
+```shell
+cd config
+git clone https://github.com/Timandes/mac-address-device-tracker.git
+cd mac-address-device-tracker
+./install.sh /config
+```
+
+Then restart Home Assistant.
+
+Update for vx.x.x:
+
+```shell
+cd config/mac-address-device-tracker
+git fetch
+git checkout vx.x.x
+./install.sh /config
+```
+
+### Configuration
+
+Open and edit configuration.yaml located in `/config` directory:
+
+```yaml
+device_tracker:
+  - platform: mac_address_device_tracker
+    consider_home: 180
+    scan_interval: 12
+    hosts:
+      daddy: 9C:A6:92:99:98:D2
+      mommy: 98:7F:53:56:1C:9E
+```
+
+Restart Home Assistant. That will create entities named `device_tracker.daddy` and `device_tracker.mommy`.
+
+