Update 'README.md'

README.md

@@ -33,3 +33,24 @@ git push -u origin main
 git remote add origin https://git.eurobytes.eu/imri/Test.git
 git push -u origin main
 ```
+
+# How do I make Git forget about a file that was tracked, but is now in .gitignore?
+
+First:
+
+```bash
+git rm -r --cached .
+git add .
+``` 
+
+Then:
+
+```bash
+git commit -am "Remove ignored files"
+```
+
+Or as a one-liner:
+
+```bash
+git rm -r --cached . && git add . && git commit -am "Remove ignored files"
+```