docs: PR and Issue templates (#211)

* feat: add pr and issue template files

* fix: add additional sections to issue template

* fix: text grammar

* docs: remove possible implementation section from issue template

* fix: prettier wrong list formatting

* small adjustments

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,48 @@
+<!--
+Thanks for reporting an issue!
+
+This issue tracker is for bugs and issues found within Mercury Parser.
+
+Please fill in as much of the template below as you're able.
+
+Platform: output of `uname -a` (UNIX), or version and 32 or 64-bit (Windows)
+Mercury-Parser Version: the specified version in your `package.json` file
+Node Version: output of `node --version`
+
+If possible, please provide a stack trace and/or code that demonstrates the
+problem, keeping it as simple and free of external dependencies as you are able.
+-->
+
+- **Platform**:
+- **Mercury Parser Version**:
+- **Node Version (if a Node bug)**:
+- **Browser Version (if a browser bug)**:
+
+## Expected Behavior
+
+<!--- Tell us what should happen -->
+
+## Current Behavior
+
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Steps to Reproduce
+
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant.  -->
+<!--- Screenshots are helpful when appropriate. -->
+
+1. 2. 3. 4.
+
+## Detailed Description
+
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+<!--- For example, what website URL are you dealing with? -->
+<!--- What is the request you are sending? What type of response are you getting? -->
+<!--- What is missing from the response? -->
+<!--- If you have a feature request, provide a detailed description of the change or addition you are proposing -->
+
+## Possible Solution
+
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,8 @@
+<!--
+Thanks for submitting a pull request!
+
+In order to get this change merged in a timely manner, please provide a short
+description, review requirements, and a link to the issue this addresses (if applicable).
+
+Contributing Guide: https://github.com/postlight/mercury-parser/blob/master/CONTRIBUTING.md
+-->