add hemdall install

Change-Id: I153cb95fd78eeca382814ddd28b738c65a2bb0bf
diff --git a/_samsung/samsunggalaxya20e.markdown b/_samsung/samsunggalaxya20e.markdown
index f02d55d..d2de97c 100755
--- a/_samsung/samsunggalaxya20e.markdown
+++ b/_samsung/samsunggalaxya20e.markdown
@@ -24,4 +24,6 @@
 
 {% include odininstall.html %}
 
+{% include heimdallinstall.html %}
+
 {% include ddinstall.html %}