Add ISSUE_TEMPLATE and CODEOWNERS (#631)

* Add ISSUE_TEMPLATE and CODEOWNERS [skip ci]

* Update Issue template [skip ci]

.github/CODEOWNERS

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+* @boopathi @vshanmugam
+packages/babel-plugin-minify-builtins/* @vshanmugam

.github/ISSUE_TEMPLATE.md

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+<!---
+Thanks for filing an issue 😄! Before you submit, please read the following:
+
+Search open/closed issues before submitting since someone might have asked the same thing before!
+
+If you have a support request or question please submit them to the #minify channel on babeljs slack: https://babeljs.slack.com/messages/minify
+
+Also have a look at the Debugging guidelines: https://github.com/babel/babili/blob/master/CONTRIBUTING.md#debugging
+
+Things required:
+
+For a bug:
+
+1. Minimal code to reproduce the bug
+2. Stack Trace if there is an Error thrown during minification
+3. Configuration - babili configuration or babelrc
+4. Whether you used it with other presets/plugins - like es2015 or env
+5. Environment: gulp, rollup, webpack, babel-cli, etc...?
+
+For an enhancement:
+
+1. Description
+2. Code Examples with transformations
+
+-->
+
+#### Input Code
+
+```js
+
+```
+
+#### Actual Output
+<!-- If an error is thrown, please provide the stack trace here -->
+
+```js
+
+```
+
+#### Expected Output
+
+```js
+
+```
+
+#### Details
+<!---
+Anything else at all
+-->