Update issue templates

Author: Stuart Cam

.github/ISSUE_TEMPLATE/bug-report-for-version-5-x-and-below.md

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+---
+name: Bug report for version 5.x and below
+about: File a bug report for NEST / Elasticsearch.Net version 5.x and below
+title: ''
+labels: Bug
+assignees: ''
+
+---
+
+<!--
+NOTE: You are about to raise a bug on an unsupported version of NEST / Elasticsearch.Net
+We will try to help, but we are under no obligation to release fixes, in accordance with
+our End of Life support policy: https://www.elastic.co/support/eol
+ -->
+
+**NEST/Elasticsearch.Net version**:
+
+**Elasticsearch version**:
+
+**Description of the problem including expected versus actual behavior**:
+A clear and concise description of what the bug is.
+
+**Steps to reproduce**:
+ 1.
+ 2.
+ 3.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Provide `ConnectionSettings` (if relevant)**:
+
+**Provide `DebugInformation` (if relevant)**:

.github/ISSUE_TEMPLATE/bug-report-for-version-6-x.md

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+---
+name: Bug report for version 6.x
+about: File a bug report for NEST / Elasticsearch.Net version 6.x
+title: ''
+labels: Bug, Bug 6.x
+assignees: ''
+
+---
+
+**NEST/Elasticsearch.Net version**:
+
+**Elasticsearch version**:
+
+**Description of the problem including expected versus actual behavior**:
+A clear and concise description of what the bug is.
+
+**Steps to reproduce**:
+ 1.
+ 2.
+ 3.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Provide `ConnectionSettings` (if relevant)**:
+
+**Provide `DebugInformation` (if relevant)**:

.github/ISSUE_TEMPLATE/bug-report-for-version-7-x.md

@@ -0,0 +1,27 @@
+---
+name: Bug report for version 7.x
+about: File a bug report for NEST / Elasticsearch.Net version 7.x
+title: ''
+labels: Bug, Bug 7.x
+assignees: ''
+
+---
+
+**NEST/Elasticsearch.Net version**:
+
+**Elasticsearch version**:
+
+**Description of the problem including expected versus actual behavior**:
+A clear and concise description of what the bug is.
+
+**Steps to reproduce**:
+ 1.
+ 2.
+ 3.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Provide `ConnectionSettings` (if relevant)**:
+
+**Provide `DebugInformation` (if relevant)**:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature
+title: ''
+labels: Feature
+assignees: ''
+
+---
+
+**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.