Issue templates (#53)

* Added issue templates to the repo.

* Updated the labels to use dedicated labels.

Author: jacobsky

.github/ISSUE_TEMPLATE/api-change-notice.md

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+---
+name: Outdated API
+about: 'This should be used when an API change in the main repo would invalidate information in the user-guide.'
+title: ''
+labels: outdated-api
+assignees: jacobsky
+
+---
+
+<!-- 
+Please link the PR with the relevant changes and which milestone in godot-rust it is associated with.
+If possible, include a brief overview of the API change and which documentation will need to be updated to reflect this.
+-->
+

.github/ISSUE_TEMPLATE/book-error.md

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+---
+name: Book error
+about: 'Report incorrect or confusing sections. For typos and grammar issues, please directly create a pull request instead.'
+title: ''
+labels: error
+assignees: ''
+
+---
+
+<!-- 
+Please provide a link to the specific section and include the incorrect passage verbatim.
+Make sure to include the reason why the information is either confusing or incorrect.
+-->
+

.github/ISSUE_TEMPLATE/new-faq-entry.md

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+---
+name: New question for the FAQ
+about: This is intended to request a specific question to be addressed that appears to be missing from the FAQ
+title: ""
+labels: faq
+assignees: ''
+
+---
+
+<!-- 
+Please either include the question verbatim or link to an issue in the godot-rust repository that should be included into the book.
+Do not propose questions that are not specifically relevant to godot-rust.
+-->
+

.github/ISSUE_TEMPLATE/new-topic-proposal.md

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+---
+name: Propose a new topic
+about: Propose a new topic to be added to the godot-rust book.
+title: ''
+labels: new-topic
+assignees: ''
+
+---
+
+<!-- 
+Please be sure to provide the desired topic as well as why the topic would be a good fit for the book.
+Include which section this would belong to if relevant.
+-->
+