Add LICENSE and README.md

Author: guangling.zgl

LICENSE

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+MIT License
+
+Copyright (c) 2019 Alipay
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Alipay AMS .net Bindings 
+
+
+## Documentation
+
+Please see the [API docs](https://global.alipay.com/doc/ams) for the most up-to-date documentation.
+
+## Usage
+
+### Preparing
+
+You need the following Integration information before starting:
+```
+clientId=your_client_id_here
+privateKey=your_private_key_here
+alipayPublicKey=your_public_key_here
+gatewayUrl=the_alipay_gateway_endpoint
+```
+
+Please see the [developer docs](https://global.alipay.com/doc/ams_upm/introduction) for help with getting the above information.
+
+see `./ams-dotnet/src/example/Program.cs` for more demo usage.
+
+## Advanced Topic
+
+### Integration Best Practice
+
+Create optimal payment experiences for your customers by following these [best practices](https://global.alipay.com/doc/ams_upm/bp) for integrations.
+
+### Using API Mock
+
+We provide an API mocking tool(currently in BETA version) for you to easily test exceptional cases. 
+
+Below are some of the default out-of-box mocking rules that basically use the payment amount value to identify the desired mock response:
+
+|API|when which input parameter|equals what|then you get a response of|
+|---|---|---|---|
+|ams/api/v1/payments/pay|payToAmount.value|9901|UNKNOWN_EXCEPTION|
+|ams/api/v1/payments/pay|payToAmount.value|9902|network timeout|
+|ams/api/v1/payments/inquiryPayment|payToAmount.value of the corresponding PAY request|9903|UNKNOWN_EXCEPTION|
+|ams/api/v1/payments/inquiryPayment|payToAmount.value of the corresponding PAY request|9904|network timeout|
+
+To use this mocking tool:
+
+1. Set gatewayUrl=https://isandbox.alipaydev.com
+2. Set alipayPublicKey to a fixed value that you can get from us through [email protected].
+
+### Acceptance testing
+
+Pass all the acceptance test cases in the Alipay Developer Center to ensure a high quality integration. Especially, test exceptions by using test cases.
+
+## To get help
+
+If you have any question or feedbacks regarding this sdk, please contact us at [email protected].
+
+For other tech integration related issues, please reach us through [email protected]. 
+
+
+## FAQ
+
+### What if I only need to use the digital signature feature ?
+
+See [Digital signature](https://global.alipay.com/doc/ams/digital_signature) for details about the signature algorithm used for data transmission.
+
+`./ams-dotnet/src/com/alipay/ams/util/SignatureUtil.cs` provides static utility methods that you can directly use.
+
+## Change history
+
+|Date|Version|Content|Backward compatible?|
+|---|---|---|---|
+|2020/10/10|1.0|v1 release|-|
+