Add reference page

Author: Sporarum

docs/_docs/reference/changed-features/binary-literals.md

@@ -0,0 +1,19 @@
+---
+layout: doc-page
+title: "Binary Integer Literals"
+nightlyOf: https://docs.scala-lang.org/scala3/reference/changed-features/binary-integer-literals.html
+---
+
+A new syntax for integer literals has been added, it is now possible to do the following:
+```scala
+val bitmask = 0b0010_0000 // equivalent to 32, 0x20
+```
+
+Binary integer literals behave similarly to hex integer literals (`0x...`), for example:
+* Both `0b...` and `0B...` are allowed
+* `0b`/`0B` on its own is disallowed, possible alternatives: `0`, `0b0`, `0B0`
+* Only `0` and `1` are allowed after the b (`b`/`B`)
+* Underscores `_` are allowed anywhere after the b, and are ignored: `0b__1__ == 0b1`
+
+
+Note: This change has been backported to Scala 2.13.13, it is therefore not technically a changed feature