Update issue templates

Author: Bart Koelman

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+_Please read our [Contributing Guides](https://github.com/json-api-dotnet/JsonApiDotNetCore/blob/master/.github/CONTRIBUTING.md) before submitting a bug._
+
+#### DESCRIPTION
+_A clear and concise description of what the bug is._
+
+#### STEPS TO REPRODUCE
+_Consider to include your code here, such as models, DbContext, controllers, resource services, repositories, resource definitions etc. Please also include the request URL with body (if applicable) and the full exception stack trace (set `options.IncludeExceptionStackTraceInErrors` to `true`) in case of errors._ It may also be helpful to include the produced SQL, which can be made visible in logs by adding this to appsettings.json:
+
+```json
+{
+  "Logging": {
+    "LogLevel": {
+      "Microsoft.EntityFrameworkCore.Database.Command": "Information"
+    }
+  }
+}
+```
+
+1.
+2.
+3.
+
+#### EXPECTED BEHAVIOR
+_A clear and concise description of what you expected to happen._
+
+#### ACTUAL BEHAVIOR
+_A clear and concise description of what happens instead._
+
+#### VERSIONS USED
+- JsonApiDotNetCore version:
+- ASP.NET Core version:
+- Entity Framework Core version:
+- Database provider:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+_Please read our [Contributing Guides](https://github.com/json-api-dotnet/JsonApiDotNetCore/blob/master/.github/CONTRIBUTING.md) before suggesting an idea._
+
+**Is your feature request related to a problem? Please describe.**
+_A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]_
+
+**Describe the solution you'd like**
+_A clear and concise description of what you want to happen._
+
+**Describe alternatives you've considered**
+_A clear and concise description of any alternative solutions or features you've considered._
+
+**Additional context**
+_Add any other context or screenshots about the feature request here._