Add ChangeLog file and fix comment in config.h

Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index c34b6ba..623b593 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2718,7 +2718,7 @@
  *
  * \warning This is currently experimental. EC J-PAKE support is based on the
  * Thread v1.0.0 specification; incompatible changes to the specification
- * might still happen. For this reason, this is disabled by default.
+ * might still happen.
  *
  * Module:  library/ecjpake.c
  * Caller: