added admin interface

admin/template_assets/vendor/metisMenu/metisMenu.css

@@ -0,0 +1,115 @@
+.metismenu .arrow {
+  float: right;
+  line-height: 1.42857;
+}
+*[dir="rtl"] .metismenu .arrow {
+  float: left;
+}
+
+/*
+ * Require Bootstrap 3.x
+ * https://github.com/twbs/bootstrap
+*/
+
+.metismenu .glyphicon.arrow:before {
+  content: "\e079";
+}
+.metismenu .active > a > .glyphicon.arrow:before {
+  content: "\e114";
+}
+
+/*
+ * Require Font-Awesome
+ * http://fortawesome.github.io/Font-Awesome/
+*/
+
+.metismenu .fa.arrow:before {
+  content: "\f104";
+}
+.metismenu .active > a > .fa.arrow:before {
+  content: "\f107";
+}
+
+/*
+ * Require Ionicons 
+*/
+
+.metismenu .ion.arrow:before {
+  content: "\f3d2"
+}
+.metismenu .active > a > .ion.arrow:before {
+  content: "\f3d0";
+}
+.metismenu .plus-times {
+  float: right;
+}
+*[dir="rtl"] .metismenu .plus-times {
+  float: left;
+}
+.metismenu .fa.plus-times:before {
+  content: "\f067";
+}
+.metismenu .active > a > .fa.plus-times {
+  transform: rotate(45deg);
+}
+.metismenu .plus-minus {
+  float: right;
+}
+*[dir="rtl"] .metismenu .plus-minus {
+  float: left;
+}
+.metismenu .fa.plus-minus:before {
+  content: "\f067";
+}
+.metismenu .active > a > .fa.plus-minus:before {
+  content: "\f068";
+}
+.metismenu .collapse {
+  display: none;
+}
+.metismenu .collapse.in {
+  display: block;
+}
+.metismenu .collapsing {
+  position: relative;
+  height: 0;
+  overflow: hidden;
+  transition-timing-function: ease;
+  transition-duration: .35s;
+  transition-property: height, visibility;
+}
+
+.metismenu .has-arrow {
+  position: relative;
+}
+
+.metismenu .has-arrow::after {
+  position: absolute;
+  content: '';
+  width: .5em;
+  height: .5em;
+  border-width: 1px 0 0 1px;
+  border-style: solid;
+  border-color: initial;
+  right: 1em;
+  transform: rotate(-45deg) translate(0, -50%);
+  transform-origin: top;
+  top: 50%;
+  transition: all .3s ease-out;
+}
+
+*[dir="rtl"] .metismenu .has-arrow::after {
+  right: auto;
+  left: 1em;
+  transform: rotate(135deg) translate(0, -50%);
+}
+
+.metismenu .active > .has-arrow::after,
+.metismenu .has-arrow[aria-expanded="true"]::after {
+  transform: rotate(-135deg) translate(0, -50%);
+}
+
+*[dir="rtl"] .metismenu .active > .has-arrow::after,
+*[dir="rtl"] .metismenu .has-arrow[aria-expanded="true"]::after {
+  transform: rotate(225deg) translate(0, -50%);
+}