Create GitHub issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,30 @@
+#### Issue description
+...
+
+#### Technical info
+* Webpack Bundle Analyzer version:
+* Webpack version:
+* Node.js version:
+* npm/yarn version:
+* OS:
+
+#### Debug info
+How do you use this module? As CLI utility or as plugin?
+
+If CLI, what command was used? (e.g. `webpack-bundle-analyzer -O path/to/stats.json`)
+
+If plugin, what options were provided? (e.g. `new BundleAnalyzerPlugin({ analyzerMode: 'disabled', generateStatsFile: true })`)
+
+What other Webpack plugins were used?
+
+It would be nice to also attach webpack stats file.
+It can be generated using these options:
+```js
+new BundleAnalyzerPlugin({
+  analyzerMode: 'disabled',
+  generateStatsFile: true,
+  // Excludes module sources from stats file so there won't be any sensitive data
+  statsOptions: { source: false }
+})`
+```
+`stats.json` will be created in Webpack bundle output directory.