Add issue and pull request templates

.github/ISSUE_TEMPLATE/console-issue.md

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+---
+name: Console Issue
+about: Some issue with your console after/during following the guide?
+---
+
+**System model**
+
+<!--Your console model, eg. Old 3DS, New 3DS, 2DS-->
+
+**Firmware version**
+
+<!--Your console system version, you can check this in System Settings-->
+
+**Luma3DS Version(If applicable)**
+
+<!--If you have Luma3DS installed, your Luma3DS version-->
+
+**Guide Section(If applicable)**
+
+<!--Section of the guide you had this issue-->

.github/ISSUE_TEMPLATE/guide-issue.md

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+---
+name: Guide Issue
+about: Did you find some issue with the guide?
+---
+
+**Pages with issue(s)**
+
+<!--Links to the page(s) with the issue(s).-->
+
+**Description of the issue(s)**
+
+<!--Describe the issue(s) with the page(s) above.-->

.github/pull_request_template.md

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+**Description**
+
+<!--What does this pull request do? Why is it needed?-->