Add PRTemplate

.github/PULL_REQUEST_TEMPLATE.md

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+I changed to use ContiguousArray< UIViewController > type to store UIViewControllers in a contiguous block of memory.
+
+ When using a large number of UIViewControllers as tabs, I think that using ContiguousArray will yield more predictable performance compared to Array.
+
+
+
+The changed files are:
+
+- Sources/PagerTabStripViewController.swift
+
+for Example:
+
+- BarExampleViewController.swift
+- ButtonBarExampleViewController.swift
+- InstagramExampleViewController.swift
+- NavButtonBarExampleViewController.swift
+- SegmentedExampleViewController.swift
+- SpotifyExampleViewController.swift
+- TwitterExampleViewController.swift
+- YoutubeExampleViewController.swift
+- YoutubeWithLabelExampleViewController.swift
+
+
+
+References
+
+- https://github.com/apple/swift/blob/main/docs/Arrays.rst
+
+- https://developer.apple.com/documentation/swift/contiguousarray
+
+- https://github.com/apple/swift/blob/main/docs/OptimizationTips.rst#advice-use-contiguousarray-with-reference-types-when-nsarray-bridging-is-unnecessary
+
+- http://jordansmith.io/on-performant-arrays-in-swift/
+- https://medium.com/@nitingeorge_39047/swift-array-vs-contiguousarray-a6153098a5