Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thank you for investing your time in contributing to our project! :sparkles:. 
+
+Read our [Code of Conduct](./CODE_OF_CONDUCT.md) to keep our community approachable and respectable.
+
+In this guide you will get an overview of the contribution workflow from opening an issue, creating a PR, reviewing, and merging the PR.
+
+## Getting started
+
+### Issues
+
+#### Create a new issue
+
+If you spot a problem, search if an issue already exists. If a related issue doesn't exist, you can open a new issue using a relevant issue form.
+
+#### Solve an issue
+
+Scan through our [existing issues](https://github.com/c9s/bbgo/issues) to find one that interests you.
+You can narrow down the search using `labels` as filters. As a general rule, we don’t assign issues to anyone.
+If you find an issue to work on, you are welcome to open a PR with a fix.
+
+### Making Changes
+
+For new large features, such as integrating binance futures contracts, please propose a discussion first before you start working on it.
+
+For new small features, you could open a pull request directly.
+
+For each contributor, you have chance to receive the BBG token through the polygon network.
+
+Each issue has its BBG label, by completing the issue with a pull request, you can get correspond amount of BBG.
+
+## Support
+
+### By contributing pull requests
+
+Any pull request is welcome, documentation, format fixing, testing, features.
+
+### By registering account with referral ID
+
+You may register your exchange account with my referral ID to support this project.
+
+- For MAX Exchange: <https://max.maicoin.com/signup?r=c7982718> (default commission rate to your account)
+- For Binance Exchange: <https://www.binancezh.com/en/register?ref=VGDGLT80> (5% commission back to your account)
+
+### By small amount cryptos
+
+- BTC address `3J6XQJNWT56amqz9Hz2BEVQ7W4aNmb5kiU`
+- USDT ERC20 address `0xeBcf7887A5b767DEb2e0C77E46A22c6Adc64E427`
+- USDT POLYGON address `0xeBcf7887A5b767DEb2e0C77E46A22c6Adc64E427`
+
+### Buying BBG token
+
+BBGO issued a token BBG for the ecosystem (contract
+address: <https://etherscan.io/address/0x3afe98235d680e8d7a52e1458a59d60f45f935c0> on ethereum).
+
+If you have feature request, you can offer your BBG for contributors.
+
+BBG/ETH liquidity pool on Uniswap: <https://app.uniswap.org/#/pool/28377>
+
+BBG/MATIC pool on quickswap: https://quickswap.exchange/#/swap?outputCurrency=0x3Afe98235d680e8d7A52e1458a59D60f45F935C0
+
+For further request, please contact us: <https://t.me/c123456789s>
+
+## Community
+
+You can join our telegram channels:
+
+- BBGO International <https://t.me/bbgo_intl>
+- BBGO Taiwan <https://t.me/bbgocrypto>
+