Create contributing.md and an issue template for bug reports

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help improve PuPHPeteer
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Reproducible example**
+```php
+// Provide a full example reproducing the bug
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Generated logs**
+Provide the logs generated by your example, see how to get them in the guidelines for contributing to this repository:
+https://github.com/nesk/puphpeteer/blob/master/.github/contributing.md#provide-logs-with-your-bug-report
+
+```
+The generated logs
+```
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. Windows 10, macOS 10.13.2, Ubuntu 18.04]
+ - Node version: [e.g. 10.4.0]
+ - PHP version [e.g. 7.2.6]
+
+My Node package manager is:
+ - [x] NPM (specify the version)
+ - [ ] Yarn (specify the version)
+ - [ ] Other (specify the name and version)
+
+**Additional context**
+Add any other context about the problem here.

.github/contributing.md

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+# Contributing to PuPHPeteer
+
+## Provide logs with your bug report
+
+Bug reports should contain logs generated by your reproducible example. To get them you must provide a logger to your PuPHPeteer instance. Say you have the following code in your bug report:
+
+```php
+use Nesk\Puphpeteer\Puppeteer;
+
+$puppeteer = new Puppeteer;
+$browser = $puppeteer->launch();
+$browser->newPage()->goto('https://example.com');
+$browser->close();
+```
+
+Require Monolog with Composer:
+
+```shell
+composer require monolog/monolog
+```
+
+And provide a Monolog instance to the `Puppeteer` constructor:
+
+```diff
+  use Nesk\Puphpeteer\Puppeteer;
+
+- $puppeteer = new Puppeteer;
++ $logPath = 'path/to/your.log';
++ 
++ $logger = new \Monolog\Logger('PuPHPeteer');
++ $logger->pushHandler(new \Monolog\Handler\StreamHandler($logPath, \Monolog\Logger::DEBUG));
++ 
++ $puppeteer = new Puppeteer(['logger' => $logger]);
+  $browser = $puppeteer->launch();
+  $browser->newPage()->goto('https://example.com');
+  $browser->close();
+```
+
+Execute your code and `path/to/your.log` will contain the generated logs, here's an example of what you can get and provide in your bug report:
+
+```
+[2018-06-07 12:41:19] PuPHPeteer.DEBUG: [options] {"read_timeout":35,"logger":{}} [] []
+[2018-06-07 12:41:19] PuPHPeteer.DEBUG: Starting process... [] []
+[2018-06-07 12:41:19] PuPHPeteer.DEBUG: [PID 15547] Process started [] []
+[2018-06-07 12:41:20] PuPHPeteer.DEBUG: [PORT 61118] [sending] {"type":"call","name":"launch","catched":false,"value":[]} [] []
+[2018-06-07 12:41:20] PuPHPeteer.DEBUG: [PORT 61118] [receiving] {"__rialto_resource__":true,"class_name":"Browser","id":"1528375280340.2676"} [] []
+```