Add changelogs and release notes

docs/releases/20100.md

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+# 2019.11.2 Magisk v20.1
+Lots of bug fixes from v20.0, and some cool new features!
+
+### Updated Magisk Manager Hiding
+Starting with Magisk v20.1 paired with Magisk Manager v7.4.0, a new hiding mode is introduced for Android 9.0+. On supported devices, Magisk Manager will download and customize a heavily obfuscated stub APK and use it as a replacement. The stub app will then download the full app into its private internal data, then dynamically load and run the actual full Magisk Manager.
+
+Note, not all Android 9.0+ devices will be able to use this feature. To use an obfuscated stub as Magisk Manager, the Magisk daemon will have to rely on a special way to communicate with the app, and some OEMs (most likely Chinese manufacturers) block certain broadcasts, breaking the communication channel.
+
+Magisk Manager will verify compatibility before it uses stubs to hide itself on Android 9.0+. **The verification relies on Magisk v20.1+, which means you have to fully upgrade and reboot in order to opt in this feature.** If you are already running a hidden Magisk Manager, **restore and upgrade Magisk Manager, upgrade Magisk and reboot, then re-hide the app**.
+
+For those incompatible with the hiding-with-stub feature, there are also a few updates that everyone, regardless whether using stubs or not, can enjoy:
+
+- You can now customize the app name of the repackaged Magisk Manager
+- Magisk Manager will generate new keys to sign the repackaged APK to prevent signature detection
+
+### Full Changelog: [here](https://forum.xda-developers.com/showpost.php?p=68966755&postcount=2)