create readme.md file about this revision folder

NirmalSilwal · web-flow · commit b111703f448c · 2021-07-21T13:27:47.000+05:30
diff --git a/Basic programs/revision/readme.md b/Basic programs/revision/readme.md
@@ -0,0 +1 @@
+> ### This folder contains all the important Leetcode problems which I resolved later while doing the revision.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+> ### This folder contains all the important Leetcode problems which I resolved later while doing the revision.`