created new category page

load random picture of category to tags list

src/css/CategoryPage.css

@@ -0,0 +1,4 @@
+#categorycontent{
+    width: 70%;
+    float: left;
+}

src/css/Preview.css

@@ -4,6 +4,13 @@
     text-align: center;
     font-weight: bold;
     max-width: 266px;
+}
+
+.tagpreviewtitle{
+    font-size: larger;
+}
+
+.videopreviewtitle{
     font-size: smaller;
 }