🐞 Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: oliverbooth
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/extension-method-request.md

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+---
+name: Extension method request
+about: Make a request for an extension method you believe should be implemented
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Type**
+Provide the fully-qualified type name of the extension method you wish to have here. Example:
+```cs
+System.String
+```
+
+**Extension method signature**
+Provide the full method signature here, without parameter names, but do not include the leading `this T x` parameter. Example:
+```cs
+string Random(int, System.Random)
+```
+
+**Parameters**
+Document each of the parameters here, with their name and description - i.e. this would be equivalent to the entry in the XMLDoc. Use a table layout like in the following example:
+| Parameter | Type | Description |
+|- |- |- |
+|length|`int`|The length of the string to generate.|
+|random|`System.Random`|The instance of `System.Random` to use for the operation|
+
+**Description**
+Briefly but concisely document the method's purpose here. i.e. This would be the `<summary>` entry in the XMLDoc.
+
+**Benefits**
+Give a reason as to why this method should be added. Does it add a need not satisified by any other X10D method? Does .NET not offer similar operations? Why should this method exist?
+
+**Drawbacks**
+Give a reason as to why this method should *not* be added. Is it an expensive operation? Does it defy .NET guidelines? If you cannot think of any, leave this blank.
+
+**(Optional) Implementation example**
+If you prefer, you can give an example of how this method might be implemented using a C# codeblock.
+Do not include the method signature here - just the body.
+```cs
+{
+    // code
+}
+```