Update README.md

README.md

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 # Locate My Device
-<b>This application is still in Alpha</b>
+This app helps to locate a lost smartphone through the use of conventional SMS. **It is in beta and under active development**
 
 ## Screenshots
 | Homescreen | SMS Chat
 |:-:|:-:|
 | <img src="/images/home.png" alt="Homescreen" width="190" height="390.641"> | <img src="/images/sms.png" width="190" height="390.641"> |
+
+## Usage
+Send an SMS to the device you want to locate to retrieve information about it.
+
+**Synopsis**
+<br/>
+```activation_command password option```
+
+**Default values**
+<br/>
+* The default value for ```activation_command``` is ```LMD```
+* The default value for ```password``` is ```0000```. It's highly encouraged to change it
+
+**Options**
+Option | Explaination 
+-------|:------------|
+locate | Will return the most accurate set of coordinates possible <br/> and a link to them pinpointed to OpenStreetMap |
+cellinfo | Will return a set of uniquely identifiable information about cell towers near the phone. <br/> You can then put this information on [OpenCellId][1] to individuate the smartphone's <br/> approximate location. Requires enabled location. |
+
+[1]: https://opencellid.org/