Created Extended Version (markdown)

Extended-Version.md

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+Extended version contains new features that not present upstream NewPipe project. These features could be not well-tested and cause some minor bugs. 
+
+
+### Release Info
+- Will be released to IzyOnDroid repo (if izzysoft accepts it)
+- apk name: `lastpipebender_extended_v0.xx.x.apk`
+
+
+### Conditions to accept a PR to `extended` branch
+- PR should be reviewed by maintainer or collaborators
+- New features should not break compatibility with older or master versions
+  - Don't forget to test with an example export file
+- New features should be changeable or closable with a setting
+- New features should be marked with a `(E)` symbol in settings
+
+
+
+### List of extended features
+-