fix(readme): add note for useProxy usage

[dai-shi]

And also follow $state convention. #620

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valtio	✅ Ready (Inspect)	Visit Preview	Jan 24, 2023 at 3:36AM (UTC)

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Size Change: 0 B

Total Size: 55.3 kB

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| Filename | Size | | :--- | :---: | | `dist/esm/index.js` | 62 B | | `dist/esm/macro.js` | 698 B | | `dist/esm/macro/vite.js` | 864 B | | `dist/esm/react.js` | 710 B | | `dist/esm/react/utils.js` | 221 B | | `dist/esm/utils.js` | 68 B | | `dist/esm/vanilla.js` | 2.27 kB | | `dist/esm/vanilla/utils.js` | 4.18 kB | | `dist/index.js` | 232 B | | `dist/macro.js` | 939 B | | `dist/macro/vite.js` | 1.09 kB | | `dist/react.js` | 653 B | | `dist/react/utils.js` | 237 B | | `dist/system/index.development.js` | 236 B | | `dist/system/index.production.js` | 170 B | | `dist/system/macro.development.js` | 779 B | | `dist/system/macro.production.js` | 556 B | | `dist/system/macro/vite.development.js` | 951 B | | `dist/system/macro/vite.production.js` | 660 B | | `dist/system/react.development.js` | 851 B | | `dist/system/react.production.js` | 466 B | | `dist/system/react/utils.development.js` | 316 B | | `dist/system/react/utils.production.js` | 221 B | | `dist/system/utils.development.js` | 241 B | | `dist/system/utils.production.js` | 176 B | | `dist/system/vanilla.development.js` | 2.4 kB | | `dist/system/vanilla.production.js` | 1.45 kB | | `dist/system/vanilla/utils.development.js` | 4.4 kB | | `dist/system/vanilla/utils.production.js` | 2.92 kB | | `dist/umd/index.development.js` | 372 B | | `dist/umd/index.production.js` | 322 B | | `dist/umd/macro.development.js` | 1.05 kB | | `dist/umd/macro.production.js` | 724 B | | `dist/umd/macro/vite.development.js` | 1.23 kB | | `dist/umd/macro/vite.production.js` | 882 B | | `dist/umd/react.development.js` | 797 B | | `dist/umd/react.production.js` | 519 B | | `dist/umd/react/utils.development.js` | 396 B | | `dist/umd/react/utils.production.js` | 297 B | | `dist/umd/utils.development.js` | 386 B | | `dist/umd/utils.production.js` | 333 B | | `dist/umd/vanilla.development.js` | 2.58 kB | | `dist/umd/vanilla.production.js` | 1.52 kB | | `dist/umd/vanilla/utils.development.js` | 4.66 kB | | `dist/umd/vanilla/utils.production.js` | 3 kB | | `dist/utils.js` | 236 B | | `dist/vanilla.js` | 2.47 kB | | `dist/vanilla/utils.js` | 4.51 kB |

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