docs: add troubleshooting section

README.md

@@ -10,6 +10,7 @@ Device Information for [React Native](https://github.com/facebook/react-native).
 * [Linking](#linking)
 * [Usage](#usage)
 * [API](#api)
+* [Troubleshooting](#troubleshooting)
 * [Release Notes](#release-notes)
 
 ## Installation
@@ -784,6 +785,61 @@ Tells if the device is a tablet.
 const isTablet = DeviceInfo.isTablet(); // true
 ```
 
+## Troubleshooting
+
+When installing or using `react-native-device-info`, you may encounter the following problems:
+
+<details>
+  <summary>[android] - Unable to merge dex / Multiple dex files</summary>
+
+  `react-native-device-info` uses `com.google.android.gms:play-services-gcm` to provide [getInstance()][#getinstance].
+  This can lead to conflicts when building the Android application.
+
+  If you're using a different version of `com.google.android.gms:play-services-gcm` in your app, you can define the 
+  `googlePlayServicesVersion` gradle variable in your `build.gradle` file to tell `react-native-device-info` what version
+  it should require.
+
+  If you're using a different library that conflicts with `com.google.android.gms:play-services-gcm`, you can simply
+  ignore this dependency in your gradle file:
+
+```
+ compile(project(':react-native-device-info')) {
+    exclude group: 'com.google.android.gms'
+}
+```
+</details>
+
+<details>
+  <summary>[ios] - ld: library not found for -lRNDeviceInfo-tvOS</summary>
+
+  Seems to be a bug caused by `react-native link`. You can manually delete `libRNDeviceInfo-tvOS.a` in `Xcode -> [Your iOS build target] -> Build Phrases -> Link Binary with Libraries`.
+</details>
+
+<details>
+  <summary>[tests] - Cannot run my test suite when using this library</summary>
+
+  `react-native-device-info` contains native code, and needs to be mocked.
+
+  Here's how to do it with jest for example:
+
+```
+// in your package.json:
+"jest": {
+  "setupFiles": [
+    "./testenv.js"
+  ],
+
+
+// testenv.js:
+jest.mock('react-native-device-info', () => {
+  return {
+    getModel: jest.fn(),
+  };
+});
+```
+</details>
+
+
 ## Release Notes
 
 See the [CHANGELOG.md](https://github.com/rebeccahughes/react-native-device-info/blob/master/CHANGELOG.md).