Create Issue Templates (fleaflet#1157)

* Update issue templates

Created templates for:
 - Bug Report
 - Feature Request
 - Question/Help

* Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,51 @@
+---
+name: Bug Report
+about: Create a bug report to help us improve
+title: "[BUG] ..."
+labels: bug, needs verification
+assignees: ''
+
+---
+
+**Describe The Bug**
+A clear and concise description of what the bug is. Try to be specific and give details when possible. Don't include your `flutter doctor` report here.
+
+**Expected Behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots & Recordings**
+If possible, add screenshots or recordings to help explain your problem. This can quickly improve diagnosis of the issue.
+
+**Additional Information**
+Add any other context about the problem here, or remove this section.
+
+---
+
+**Doctors Report**
+```
+Paste your report from `flutter doctor` here
+```
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+---
+
+**Severity**
+Select two (one from fatality, one from frequency). This will help us to label the issue quicker and decide what needs attention first.
+ - [ ] Non-fatal
+ - [ ] Fatal
+ - [ ] Uncommon
+ - [ ] Common
+
+**Applicable Platforms**
+Only select those that you've tested on - one or more. If possible, test on a variety of platforms.
+ - [ ] Android
+ - [ ] iOS
+ - [ ] Web
+ - [ ] Windows
+ - [ ] Others (beta platforms)

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Community Maintained Plugins
+    url: https://flutter-map.vercel.app/plugins/list
+    about: If you need help with a plugin, please ask on there first

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,32 @@
+---
+name: Feature Request
+about: Suggest an idea for this project
+title: "[FEATURE] ..."
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe The Problem**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe Your Solution**
+A clear and concise description of what you want to happen.
+
+**Alternatives/Workarounds**
+A clear and concise description of any alternative solutions or features you've considered.
+
+---
+
+**Additional Information**
+Add any other context or screenshots about the feature request here.
+
+**Applicable Platforms**
+Only select those that you've tested on - one or more. If possible, test on a variety of platforms.
+
+ - [ ] All/any
+ - [ ] Android
+ - [ ] iOS
+ - [ ] Web
+ - [ ] Windows
+ - [ ] Others (beta platforms)

.github/ISSUE_TEMPLATE/general.md

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+---
+name: General
+about: Found something interesting? Or just want to talk?
+title: "[GENERAL] ..."
+labels: general
+assignees: ''
+
+---
+
+_Perhaps the discussion functionality on GitHub would be more suitable? Please consider, but feel to post in either!_

.github/ISSUE_TEMPLATE/question-help.md

@@ -0,0 +1,13 @@
+---
+name: Question/Help
+about: Ask a question, or ask for help
+title: "[QUESTION] ..."
+labels: question/help
+assignees: ''
+
+---
+
+_Perhaps another template might be more suitable? Please choose appropriately._
+
+**What do you need support with?**
+Say whatever you need to, and whatever you can to help us help you. Thanks!