Add GitHub issue template

.github/issue_template.md

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+<!--
+  Hi there! Thank you for discovering and submitting an issue.
+
+  Before you submit this; let's make sure of a few things.
+  Please make sure the following boxes are ticked if they are correct.
+  If not, please try and fulfill these first.
+-->
+
+<!-- Checked checkbox should look like this: [x] -->
+- [ ] I am on the [latest](https://github.com/soutar/hyperterm-summon/releases/latest) hyperterm-summon version
+- [ ] I have searched the [issues](https://github.com/soutar/hyperterm-summon/issues) of this repo and believe that this is not a duplicate
+
+<!--
+  Once those are done, if you're able to fill in the following list with your information,
+  it'd be very helpful to whoever handles the issue.
+-->
+
+- **OS version and name**: <!-- Replace with version + name -->
+- **Hyper.app version**: <!-- Replace with version -->
+- **hyperterm-summon version**: <!-- Replace with version -->
+- **Link of a [Gist](https://gist.github.com/) with the contents of your .hyper.js**: <!-- Gist Link Here -->
+- **Relevant information from devtools** _(CMD+ALT+I on Mac OS, CTRL+SHIFT+I elsewhere)_: <!-- Replace with info if applicable, or N/A -->
+
+## Issue
+<!-- Now feel free to write your issue, but please be descriptive! If you can, please list steps to reproduce the issue. Thanks again 🙌 ❤️ -->