Create CONTRIBUTING.md

Author: khoih-prog

CONTRIBUTING.md

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+## Contributing to ESP32_ISR_Servo
+
+### Reporting Bugs
+
+Please report bugs in ESP32_ISR_Servo if you find them.
+
+However, before reporting a bug please check through the following:
+
+* [Existing Open Issues](https://github.com/khoih-prog/ESP32_ISR_Servo/issues) - someone might have already encountered this.
+
+If you don't find anything, please [open a new issue](https://github.com/khoih-prog/ESP32_ISR_Servo/issues/new).
+
+### How to submit a bug report
+
+Please ensure to specify the following:
+
+* Arduino IDE version (e.g. 1.8.10) or Platform.io version
+* `ESP32` Core Version (e.g. ESP32 Core v1.0.4)
+* Contextual information (e.g. what you were trying to achieve)
+* Simplest possible steps to reproduce
+* Anything that might be relevant in your opinion, such as:
+  * Operating system (Windows, Ubuntu, etc.) and the output of `uname -a`
+  * Network configuration
+
+
+### Example
+
+```
+Arduino IDE version: 1.8.10
+ESP32 Core Version 1.0.4
+OS: Ubuntu 16.04 LTS
+Linux Inspiron 4.4.0-170-generic #199-Ubuntu SMP Thu Nov 14 01:45:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
+
+Context:
+I encountered a crash while trying to control the Servo.
+
+Steps to reproduce:
+1. ...
+2. ...
+3. ...
+4. ...
+
+### Sending Feature Requests
+
+Feel free to post feature requests. It's helpful if you can explain exactly why the feature would be useful.
+
+There are usually some outstanding feature requests in the [existing issues list](https://github.com/khoih-prog/ESP_WiFiManager/issues?q=is%3Aopen+is%3Aissue+label%3Aenhancement), feel free to add comments to them.
+
+### Sending Pull Requests
+
+Pull Requests with changes and fixes are also welcome!