Update issue templates

a first bug report template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Versions (please complete the following information):**
+ - Chokidar version [e.g. 2.0.4, or commit hash]
+ - Node version [e.g. 10.4.1]
+ - OS version: [e.g. Ubuntu 16.04, or Windows 10]
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+Ideally prove a problem by isolating and making it reproducible with a very short sample program, which you could paste here:
+
+```
+var chokidar = require('chokidar');
+var fs = require('fs');
+// One-liner for files and directories starting with 'test'
+chokidar.watch('test*', {}).on('all', (event, path) => {
+  console.log(event, path);
+});
+fs.writeFileSync('test.txt', 'testing 1');
+// In a comment describe expected output versus observed problem
+```
+
+Most valuable could be one or more test cases for [test.js](https://github.com/paulmillr/chokidar/blob/master/test.js) to demonstrate the problem.
+
+**Expected behavior**
+A clear and concise description of what you expect to happen.
+
+**Additional context**
+Add any other context about the problem here.
+Optionally nice to know what project you are working on.