read me updated (#1907)

Author: neel1998

README.md

@@ -54,8 +54,8 @@ Please join us on the following channels:
   </table>
   <table>
     <tr>
-     <td><img src="/docs/images/instrument_wavegenerator_view.png"></td>
-     <td><img src="/docs/images/instrument_logic_analyzer_view.png"></td>
+     <td><img src="/docs/images/instrument_wave_generator_analog.png"></td>
+     <td><img src="/docs/images/instrument_wave_generator_digital.png"></td>
     </tr>
   </table>
   <table>
@@ -82,7 +82,8 @@ Please join us on the following channels:
   </table>
   <table>
     <tr>
-     <td><img src="/docs/images/instrument_robotic_arm_view.png" width = "500"></td>
+     <td><img src="/docs/images/instrument_robotic_arm_view.png" width = "1000"/></td>
+     <td><img src="/docs/images/instrument_logic_analyzer_view.png"/></td>
     </tr>
   </table>
 
@@ -107,14 +108,23 @@ Please join us on the following channels:
 |    AcceleroMeter     | Measures the acceleration of the device                  | 		 ✓       |
 |     Gyro Meter     | Measures the rate of rotation                  | 		 ✓       |
 |    Compass     | Measures the absolute rotation relative to earth magnetic poles                  | 		 ✓       |
-|    Thermometer     | Measures the ambient temperature                  | 		      |
-|    Robotic Arm Controller     | Allows to control 4 servo motors of the robotic arm | 		       |
+|    Thermometer     | Measures the ambient temperature                  | 		 ✓     |
+|    Robotic Arm Controller     | Allows to control 4 servo motors of the robotic arm independently| 		  ✓     |
 ## How to set up the Android app in your development environment
 
-  Minimum Android version 5.0 (API Level 21)
+  Minimum Android version 6.0 (API Level 23)
 
   Maximum Android version 8.1 (API Level 27)
 
+### Application Flavors
+
+There are 2 flavors (build variants) of PSLab Android application.
+
+1. #### Play Store Flavor
+  - Play Store flavor uses Google Maps to display location stored in logs in Data logger.
+2. #### Fdroid Flavors
+  - Fdroid flavor uses Open Street Maps to display location stored in logs in Data logger.
+
 ### Development Setup
 
 Before you begin, you should already have the Android Studio SDK downloaded and set up correctly. You can find a guide on how to do this here: [Setting up Android Studio](http://developer.android.com/sdk/installing/index.html?pkg=studio)