feat: Add issue and pr templates

.github/ISSUE_TEMPLATE/bug_report.md

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+Issue tracker is **ONLY** used for reporting bugs. 
+
+New features should be discussed in the [discussions](https://github.com/bcakmakoglu/vue-flow/discussions).
+
+# Title
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+
+## 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 -->
+1.
+2.
+3.
+4.
+
+## Context (Environment)
+<!--- 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 -->
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Detailed Description
+<!--- Provide a detailed description of the change or addition you are proposing -->
+
+## Possible Implementation
+<!--- Not obligatory, but suggest an idea for implementing addition or change -->

.github/PULL_REQUEST_TEMPLATE/general.md

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+# Title
+<!--- A title for this pr -->
+
+## What's changed?
+<!--- Tell us what changes this pr contains -->
+
+-
+-
+-
+
+## Fixes
+<!--- Tell us what issues this pr fixes -->
+
+- #issue