Update README for rtl8195 light_example

(cherry-picked from commit 6c257ed)

Author: hongye-samsung

apps/rtl8195/light_example/README.md

@@ -1,4 +1,4 @@
-# SmartThings Device SDK Switch Example
+# SmartThings SDK for Direct Connected Devices for C - Light Example
 
 ## Introduction
 
@@ -15,18 +15,41 @@ Components and Capabilities are contained in device profile. You can create a de
 
 This example assumes the following components and capabilities are used. :  
 
-'main' component  
-- 'healthCheck' capability  
-- 'switch' capability  
-- 'switchLevel' capability  
-- 'colorTemperature' capability  
-- 'activityLightingMode' capability  
-
-'monitor' component  
-- 'dustSensor' capability  
-
-('healthCheck' capability is automatically added by Developer Workspace. It doesn't need handler at device side)
-
-## SmartThings Device SDK config
-If you want to use specific SmartThings Device SDK build options, you can directly modify the build configuration file. For this example, SmartThings Device SDK config is saved in 'sdkconfig.h' file.
+`main` component
+- `healthCheck` capability
+- `switch` capability
+- `switchLevel` capability
+- `colorTemperature` capability
+- `activityLightingMode` capability
+
+`monitor` component
+- `dustSensor` capability
+
+(`healthCheck` capability is automatically added by Developer Workspace. It doesn't need handler at device side)
+
+## SmartThings SDK for Direct Connected Devices - Config
+If you want to use specific SmartThings Device SDK build options, you can directly modify the build configuration file. For this example, SmartThings Device SDK config is saved in 'sdkconfig.h' file. If you want to change this, please execute the following :
+```sh
+$ cd ~/st-device-sdk-c-ref
+$ vim apps/rtl8195/light_example/sdkconfig.h
+```
+
+## Test device schematics
+This example uses RTL8195 GPIO like below.
+Please refer below picture for __Ameba RTL8195AM__.
+> Note: If your device's schematics doesn't match with belows.
+> Please modify GPIO defines for your device at [device_control.h](main/device_control.h)
+> ```c
+> #define GPIO_INPUT_BUTTON      PC_1
+>
+> #define GPIO_OUTPUT_COLORLED_R PC_2
+> #define GPIO_OUTPUT_COLORLED_G PC_0
+> #define GPIO_OUTPUT_COLORLED_B PB_5
+> #define GPIO_OUTPUT_COLORLED_0 PC_4
+> ```
+
+### Ameba RTL8195AM
+| Ameba RTL8195AM                                                       |
+|-----------------------------------------------------------------------|
+|![Ameba RTL8195AM](../../../doc/res/Light_Example_AMEBA_RTL8195AM.png) |