Change from Added to Add

Author: DonJayamanne

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Enhancements
 
-1. Added experiment for reloading feature of debugging web apps.
+1. Add experiment for reloading feature of debugging web apps.
    ([#3473](https://github.com/Microsoft/vscode-python/issues/3473))
 1. Activate conda environment using path when name is not available.
    ([#3834](https://github.com/Microsoft/vscode-python/issues/3834))