Adds a CHANGELOG.md for package conformity

Author: amit-nayar

CHANGELOG.md

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+## [1.10.3] - 11 Jan 2021
+
+- Updates copyright year to 2021. (#75)
+
+## [1.10.2] - 20 Nov 2020
+
+- Updates for PSPDFKit for iOS 10.1 and Xcode 12.2. (#74)
+
+## [1.10.1] - 28 Oct 2020
+
+- Updates to PSPDFKit for Android 6.5.3 (#71)
+
+## [1.10.0] - 9 Oct 2020
+
+- Updates to PSPDFKit for Android 6.5 (#66)
+
+## [1.9.0] - 3 Mar 2020
+
+- Updates to PSPDFKit for Android 6.2 (#62)
+
+## [1.8.0] - 21 Jan 2020
+
+- Updates to PSPDFKit for Android 6.1.1 (#54)
+- Adds Instant JSON document support (#48)
+- Fixes example project (#50, #53)
+
+## [1.7.1] - 26 Nov 2019
+
+- Exposes the `pageLayoutMode` and `isFirstPageAlwaysSingle` configuration options (#46)
+
+## [1.7.0] - 8 Oct 2019
+
+- Updates to PSPDFKit for Android 6.0 (#36)
+- Updates to PSPDFKit for iOS 9 (#42)
+- Adds Forms API (#28)