Create tecno.md

Add TECNO vendor to vendors list

_vendors/tecno.md

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+---
+name: Tecno
+layout: vendor
+permalink: tecno
+explanation: 'Aggressive battery setting causes app to be completely halted, like frozen in time, so, timers, services, foreground services, all of them stop working until you return manually to the app, this affects all apps across the device'
+user_solution: 'Go to Settings> Battery Lab> Battery Saving Settings > Disable "Power Saving Management For Apps"'
+developer_solution: 'n/a'
+award: 3
+---
+
+Y U say stock Android!?