!522 添加材质按钮

src/UI/Components/MaterialExplorer.tsx

@@ -1,4 +1,4 @@
-import { ContextMenu, Menu, MenuItem } from '@blueprintjs/core';
+import { ContextMenu, Menu, MenuItem, Icon } from '@blueprintjs/core';
 import { observer } from 'mobx-react';
 import * as React from 'react';
 import { Asset } from './Asset';
@@ -98,6 +98,17 @@ export class MaterialExplorer extends React.Component<{ materialTable: MaterialT
                         )
                     })
                 }
+                <div style={{
+                    height: 80,
+                    width: 80,
+                    textAlign: "center",
+                    paddingTop: 8,
+                    cursor: "pointer"
+                }}
+                    onClick={this.handleCreateMaterial}
+                >
+                    <Icon icon="add" iconSize={50} color="#ccc" />
+                </div>
             </div>
         )
     }