Add issue templates to help with organization

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something isn't working as intended
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+<!--- 
+
+Please do not delete this issue template as it helps us organize and easily work on issues!!
+
+NOTE: Before posting, please make sure you have
+ 1. Searched the README
+ 2. Searched the Issues tab for similar bugs
+ 3. Please provide the required information in the template - HTML code and Html widget configuration
+ --->
+
+**Describe the bug:**
+<!--- Please provide a clear and concise description of the bug --->
+
+**HTML to reproduce the issue:**
+<!--- Please provide your HTML code below. If it contains sensitive information please post a minimal reproducible HTML snippet. --->
+
+**`Html` widget configuration:**
+<!--- Please provide your HTML widget configuration below --->
+
+**Expected behavior:**
+<!--- Expected behavior, if applicable, otherwise please delete --->
+
+**Screenshots:**
+<!--- Screenshots can be helpful to analyze your issue. Please delete this section if you don't provide any. --->
+
+**Device details and Flutter/Dart/`flutter_html` versions:**
+<!--- These details can be helpful to analyze your issue. Please delete this section if you don't provide any.  --->
+
+**Stacktrace/Logcat**
+<!--- The error stacktrace if applicable, otherwise please delete --->
+
+**Additional info:**
+<!--- Any other info relevant to the bug, otherwise please delete --->
+
+**A picture of a cute animal (not mandatory but encouraged)**
+<!--- A picture of a cute animal that would nicely complement this bug report. 
+If you don't have one, please delete, just know we will be a little disappointed ;) --->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for flutter_html
+title: "[FEATURE]"
+labels: enhancement
+assignees: ''
+
+---
+
+<!--- 
+
+Please do not delete this issue template as it helps us organize and easily work on issues!!
+
+NOTE: Before posting, please make sure you have
+ 1. Searched the README
+ 2. Searched the Issues tab for similar feature requests
+ --->
+
+**Describe your feature request**
+<!--- Please provide a clear and concise description of the feature request --->
+
+**Additional context**
+<!--- Any other info relevant to the feature request, otherwise please delete --->
+
+**A picture of a cute animal (not mandatory but encouraged)**
+<!--- A picture of a cute animal that would nicely complement this feature request. 
+If you don't have one, please delete, just know we will be a little disappointed ;) --->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question about flutter_html
+title: "[QUESTION]"
+labels: question
+assignees: ''
+
+---
+
+<!--- 
+NOTE: Before posting, please make sure you have
+ 1. Searched the README
+ 2. Searched the Issues tab for similar questions
+ --->
+
+Type question here.
+
+**A picture of a cute animal (not mandatory but encouraged)**
+<!--- A picture of a cute animal that would nicely complement this question. 
+If you don't have one, please delete, just know we will be a little disappointed ;) --->