add hemdall install

Change-Id: I153cb95fd78eeca382814ddd28b738c65a2bb0bf
diff --git a/_samsung/samsunggalaxytab77.markdown b/_samsung/samsunggalaxytab77.markdown
index 857c7e3..0acc16f 100644
--- a/_samsung/samsunggalaxytab77.markdown
+++ b/_samsung/samsunggalaxytab77.markdown
@@ -53,4 +53,6 @@
 
 {% include odininstall.html %}
 
+{% include heimdallinstall.html %}
+
 {% include ddinstall.html %}