Added env.example file with example environment variables 📧

Author: SyedaMahamFahim

.env.example

@@ -1,2 +1,4 @@
 NEXT_PUBLIC_SANITY_PROJECT_ID="your-project-id"
-NEXT_PUBLIC_SANITY_DATASET="your-dataset"
+NEXT_PUBLIC_SANITY_DATASET="your-dataset"
+GITHUB_COMMENT_REPO_ID="Your-repo-id"
+GITHUB_COMMENT_CATEGORY_ID="Your-category-id"