add button component

wax-prosemirror-components/src/components/Button.js

+import React from "react";
+import styled from "styled-components";
+import { ButtonStyles } from "wax-prosemirror-themes";
+
+const ButtonStyled = styled.button`
+  opacity: ${props => (props.select ? 1 : 0.4)};
+  pointer-events: ${props => (props.select ? "default" : "none")};
+  color: ${props =>
+    props.isActive ? props.theme.colorPrimary : props.theme.colorButton};
+  &:hover {
+    color: ${props => (props.isActive ? props.theme.colorPrimary : "#000")};
+  }
+  ${ButtonStyles};
+`;
+
+const Button = ({ view = {}, item }) => (
+  <ButtonStyled
+    type="button"
+    isActive={item.active && item.active(view.state)}
+    title={item.title}
+    disabled={item.enable && !item.enable(view.state)}
+    onMouseDown={e => {
+      e.preventDefault();
+      item.run(view.state, view.dispatch);
+    }}
+    select={item.select && item.select(view.state)}
+  >
+    {item.content}
+  </ButtonStyled>
+);
+
+export default Button;