Added changelog

CHANGELOG.md

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+# v1.1.0 - To be released
+Lots of fixes for mathematical typos and fixes to improve consistency across sections and chapters.
+About 6 pages of new content.
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+New or changed content:
+* New section on gate-by-gate simulation in Section 7.8.1.
+* Rewritten Section 7.5 to use more concrete and better bound on approximation error, and updated 7.8.2 to match.
+* Moved Chapter 9 sections "More rules for the H-box", "From arbitrary reversible functions to Toffolis" and "2-leel operators" to advanced material.
+* A new example and exercise in Chapter 6.
+* A lot more references in Chapter 11.
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+Bug fixes and consistency:
+* More careful about using \propto when an equality is up to scalar.
+* Streamlined some notations across chapters.
+* Numerous (mathematical) typos fixed across all chapters.
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+# v1.0.0 - 11-09-2024
+Initial release