Add new issue templates

Add issue templates for bug reports and feature requests.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,36 @@
+---
+name: Bug Report
+about: Report unexpected behavior
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Unexpected behavior :x:**
+<!-- Explain in as few sentences as possible what the unexpected behavior is. -->
+
+**Expected behavior :heavy_check_mark:**
+<!-- Describe clearly what you expected to happen. -->
+
+**Reproducing :computer_mouse:**
+<!-- Detail the process for recreating the bug and include the simplest possible code example that can be ran to reproduce the bug. -->
+
+1. Execute `flutter run` on the code sample <!-- (see "Code sample" section below) -->
+2. ... <!-- describe steps to demonstrate bug -->
+3. ... <!-- for example "Swipe right and see crash" -->
+
+<details>
+<summary>Code sample</summary>
+<!-- Copy and paste the complete code sample between the following two lines of backticks. -->
+
+```dart
+```
+
+</details>
+
+**Screenshots (optional) :camera_flash:**
+<!-- If this is a visual bug, provide screenshot(s) here. -->
+
+**Potential fixes (optional) :wrench:**
+<!-- Add any potential ideas for fixing the unexpected behavior. -->

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,23 @@
+---
+name: Feature Request
+about: Suggest an improvement for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Complete the following checklist before opening this issue :heavy_check_mark:**
+<!-- - [x] This is an example of how to check the following boxes -->
+- [ ] This improvement has not been suggested already
+- [ ] This suggestion is not a solution to a bug
+- [ ] I've read the [contributing guidelines](https://github.com/jushutch/swiping_card_deck/blob/36a0424f0069453043b6e67b3be076e03cfafa42/CONTRIBUTING.md)
+
+**The Idea :bulb:**
+<!-- Describe the idea/suggestion in as few words as possible -->
+
+**Use Case :briefcase:**
+<!-- Describe how this improvement would be useful. Include an example of why users or developers would want this feature and how they might use it. -->
+
+**Implementation** (optional) :wrench:
+<!-- Describe the details of this improvement and include any potential implementation ideas. This field is REQUIRED if you plan on working on this improvement by yourself. Refer to the contributing guidelines for more information on how to contribute code. -->