Add "Slicing with Ranges" rule

Follow up rubocop/rubocop#12594 (comment).

This PR adds "Slicing with Ranges" rule.

Author: koic

README.adoc

@@ -4552,6 +4552,48 @@ obj.then { |x| x.do_something }
 
 NOTE: You can read more about the rationale behind this guideline https://bugs.ruby-lang.org/issues/14594[here].
 
+=== Slicing with Ranges
+
+`[0..-1]` in `ary[0..-1]` is redundant and simply synonymous with `ary`.
+
+[source,ruby]
+----
+# bad
+ary[0..-1]
+ary[0..nil]
+ary[0...nil]
+
+# good
+ary
+----
+
+Ruby 2.6 introduced endless ranges.
+
+[source,ruby]
+----
+# bad
+ary[1..-1]
+ary[1..nil]
+
+# good
+ary[1..]
+----
+
+Ruby 2.7 introduced beginless ranges. But, unlike the somewhat obscure `-1` in `ary[1..-1]`, the `0` in `ary[0..42]` is clear
+as a starting point. In fact, changing it to `ary[..42]` could potentially make it less readable. Therefore, `ary[0..42]`
+should respect the original programmer's intent. On the other hand, `ary[nil..42]` could be replaced with `ary[..42]`.
+Similarly, `ary[1..nil]` could be replaced with `ary[1..]`.
+
+[source,ruby]
+----
+# bad
+ary[nil..42]
+
+# good
+ary[..42]
+ary[0..42]
+----
+
 == Numbers
 
 === Underscores in Numerics [[underscores-in-numerics]]