Create CHANGELOG.md

Added a CHANGELOG.md and added the mention of the updates for the T&Cs

CHANGELOG.md

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+# Change Log
+
+> **_NOTE:_** This file includes all relevant changes to the backend of the [PACT Catalog](https://catalog.carbon-transparency.com). All changes related to the catalog's front end will be listed in the [`pact-catalog`]([https://github.com/wbcsd/pact-catalog](https://github.com/sine-fdn/pact-catalog-frontend)) repository
+
+**********Added**********
+
+**************Changed**************
+
+## 2023-07-20
+Updated the T&Cs as per the latest T&Cs from WBCSD
+
+**********Fixed**********
+
+## 2023-06-15
+
+General and incremental refactoring with some minor bug fixes
+
+**********Added**********
+
+**************Changed**************
+- Refactoring
+
+**********Fixed**********
+- Navbar links behavior