Added missing file for previous commit.

Stewori · Stewori · commit d9bfee18cc9d · 2020-06-08T16:55:20.000+02:00
diff --git a/legacy-dev.md b/legacy-dev.md
@@ -0,0 +1,11 @@
+---
+title: Legacy
+---
+## Development before move to Github
+
+### [Bug tracker](https://bugs.jython.org/)
+
+### [Mercurial](https://hg.python.org/jython/)
+
+### [Github mirror](https://github.com/jython/frozen-mirror/)
+This mirror is now frozen.
