update readme, add issue/pr templates

Author: shellscape

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,36 @@
+<!--
+  Please note: This template is not optional. Please fill in all fields and
+  questions otherwise the issue may be closed. Please provide actual technical
+  information about errors, if an error has occured.
+-->
+
+* Node Version:
+* NPM Version:
+* postcss-values-parser Version:
+
+This issue is regarding a problem with:
+- [ ] Standard CSS
+- [ ] LESS
+- [ ] SCSS
+- [ ] SASS
+
+If you have a large amount of code to share which demonstrates the problem you're experiencing, please provide a link to your
+repository rather than pasting code. Otherwise, please paste relevant short snippets below.
+
+```css
+// offending or problematic css
+```
+
+```js
+// any js you'd like to add. this section can be removed if none
+```
+
+```
+// actual error output, if error was thrown
+```
+
+### Expected Behavior
+
+### Actual Behavior
+
+### How can we reproduce the behavior?

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,11 @@
+**Which issue #** if any, does this resolve?
+
+<!-- PRs must be accompanied by related tests -->
+
+Please check one:
+- [ ] New tests created for this change
+- [ ] Tests updated for this change
+
+---
+
+<!-- add additional comments here -->

README.md

@@ -12,6 +12,7 @@ following the same node, container, and traversal patterns as PostCSS.
   <b>:rocket: &nbsp; Are you ready to tackle ES6 and hone your JavaScript Skills?</b> &nbsp; :rocket:<br/>
   Check out these outstanding <a href="https://es6.io/">ES6 courses</a> by <a href="https://github.com/wesbos">@wesbos</a>
 </p>
+
 ---
 
 As with PostCSS and postcss-selector-parser, this parser generates an