add codeowners, issue templates and PR template (#162)

Author: rosieyohannan

.github/CODEOWNERS

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+* @circleci/docs @circleci/docs-friends @circleci/lifecycle @circleci/product-mgmt-product-experience
+

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug
+about: A technical problem
+---
+
+# Description
+Describe the bug you found.
+
+# Location
+Describe where you caught the bug.
+If the bug occurs in a specific document,
+add the link here.
+
+# Steps to Reproduce
+Describe the steps you took to produce the bug.

.github/ISSUE_TEMPLATE/grammatical_error.md

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+---
+name: Grammatical Error
+about: Grammatically incorrect writing
+---
+
+# Location
+A link to the document with the error.
+
+# Error Details
+A brief description of the error.

.github/ISSUE_TEMPLATE/inconsistent.md

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+---
+name: Inconsistent
+about: Conflicting information
+---
+
+# Locations
+Add a link to the document (or documents)
+with the conflicting documentation.
+
+# Conflict Description
+Describe the conflicting documentation.

.github/ISSUE_TEMPLATE/incorrect.md

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+---
+name: Incorrect
+about: Incorrect information
+---
+
+# Locations
+Add a link to the document
+with the incorrect information.
+
+# Details
+Describe the incorrect information in the document.
+Extra evidence like build output or other links
+is helpful in "proving" that documentation isn't correct.

.github/ISSUE_TEMPLATE/typo.md

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+---
+name: Typo
+about: A typographical error
+---
+
+# Location
+A link to the document with the typo.
+
+# Error Details
+A description of the typo.

.github/ISSUE_TEMPLATE/unclear.md

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+---
+name: Unclear
+about: Confusing language
+---
+
+# Location
+A link to the document that is unclear.
+
+# Explanation
+Describe what confused you about the document.
+This could be syntax, word choice, sentence length, or something entirely different.

.github/ISSUE_TEMPLATE/undocumented.md

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+---
+name: Undocumented
+about: Missing information
+---
+
+# Missing Information
+Give a brief overview of the information you were looking for.
+
+# Already Looked
+Provide a list of places you've already looked for this information.
+Links are much appreciated.
+
+# Potential Locations
+Tell us where you would expect to find this information.
+This can be either an existing document,
+or an entirely new document.

.github/pull_request_template.md

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+# Description
+What did you change?
+
+# Reasons
+Why did you make these changes?
+
+# Content Checklist
+Please follow our style when contributing to CircleCI docs. Our style guide is here: [https://circleci.com/docs/style/style-guide-overview](https://circleci.com/docs/style/style-guide-overview).
+
+Please take a moment to check through the following items when submitting your PR (this is just a guide so will not be relevant for all PRs):
+
+- [ ] Break up walls of text by adding paragraph breaks.
+- [ ] Consider if the content could benefit from more structure, such as lists or tables, to make it easier to consume.
+- [ ] Keep the title between 20 and 70 characters.
+- [ ] Consider whether the content would benefit from more subsections (h2-h6 headings) to make it easier to consume.
+- [ ] Check all headings h1-h6 are in sentence case (only first letter is capitalized).
+- [ ] Include relevant backlinks to other CircleCI docs/pages.