Add Open Android Projects (#612)

Rename tutorials/ to doc/.

doc/OpenAndroidProjects.md

@@ -0,0 +1,21 @@
+# Open Android Projects
+
+Open Android distributions and devices.
+
+- [**/e/OS**](https://e.foundation/e-os/)
+- [**Fairphone**](https://www.fairphone.com/)
+- [**GrapheneOS**](https://grapheneos.org/)
+- [**Librephone**](https://librephone.fsf.org/)
+- [**LineageOS**](https://lineageos.org/)
+- [**Mobian**](https://mobian-project.org/)
+- [**PinePhone**](https://pine64.org/devices/pinephone/)
+- [**PostmarketOS**](https://postmarketos.org/)
+- [**PureOS**](https://pureos.net/)
+- [**Replicant**](https://www.replicant.us/)
+- [**Sailfish OS**](https://sailfishos.org/)
+- [**Shiftphone**](https://www.shift.eco/en/)
+- [**Spirit Smartphone**](https://github.com/V3lectronics/SPIRIT)
+- [**Ubuntu Touch**](https://www.ubuntu-touch.io/)
+- [**Volla Phone / Volla OS**](https://volla.online/)
+
+Overview of unlockable Bootloader: [**Bootloader Unlock Wall of Shame**](https://github.com/zenfyrdev/bootloader-unlock-wall-of-shame)