[futurepress#86] README: Cleartext traffic on Android

Author: birdofpreyru

README.md

@@ -109,11 +109,21 @@ and [old][Old Architecture] RN architectures.
 - For **Android**:
   - In the `build.gradle` file set `minSdkVersion` equal `28`
     ([SDK 28 — Android 9](https://developer.android.com/studio/releases/platforms#9.0),
-    released in August 2018), or larger.
-
+    released in August 2018), or larger. \
     **Note:** _Support of older SDKs is technically possible, but it is not
     a priority now._
 
+  - Android SDK 28 and above
+    [forbids Cleartext / Plaintext HTTP](https://developer.android.com/privacy-and-security/risks/cleartext)
+    by default. Thus, to access locally running server over HTTP from within
+    your app, you should either allow all uses of HTTP in your app by adding
+    `android:usesCleartextTraffic="true"` attribute to `<application>` element
+    in the `AndroidManifest.xml`
+    ([see how it is done in the example app](https://github.com/birdofpreyru/react-native-static-server/blob/master/example/android/app/src/main/AndroidManifest.xml));
+    or alternatively you should use
+    [network security configuration](https://developer.android.com/privacy-and-security/security-config)
+    to permit cleartext HTTP for selected domains only.
+
 - For **iOS**:
   - After installing the package, enter `ios` folder of the app's codebase
     and execute