Added preview of the file "readme" like in github with using showdown.js parser (http://github.com/coreyti/showdown).

web/less/files.less

@@ -145,4 +145,33 @@
       margin: 0;
     }
   }
+}
+
+.readme-view {
+  width: 100%;
+  margin-bottom: @baseLineHeight;
+  border: 1px solid @treeHeaderBorder;
+
+  .readme-header {
+    padding: 8px;
+    line-height: @baseLineHeight;
+    text-align: left;
+    vertical-align: bottom;
+    #gradient > .vertical(@treeHeaderHighlight, @treeHeader);
+    border-bottom: 1px solid lighten(@treeHeaderBorder, 5%);
+    font-weight: bold;
+    color: @gray;
+    text-shadow: 1px 1px 1px rgba(255,255,255,1);
+    height:28px;
+    .meta {
+      float: left;
+      padding: 4px 0;
+      font-size: 14px;
+    }
+  }
+
+  #readme-content {
+    padding: 30px;
+    color: @black;
+  }
 }