Add issues directory to track issues.

issues/Issue2.java

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+/* Currently multiDeclRefactor would failed to refactor below code,
+* See issue: https://github.com/CharlesZ-Chen/multiDeclRefactor/issues/2
+* output would like this:
+* <code>
+* class Issue2 {
+*  String Object c = new C() {  a, b;
+*   Object d; String e,f;
+* }
+*
+* interface C {}
+* </code>
+*/
+
+class Issue2 {
+    Object c = new C() { String a, b; };    
+    Object d; String e,f;
+}
+
+interface C {}

issues/README.md

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+This directory records some code cases that `multiDeclRefactor` currently cannot handle correctly.
+Once the issue represented by the code case in this directory solved, that code case should be moved to `test` directory as a regression test case.