Create issue template

Signed-off-by: Jguer <me@jguer.space>

ISSUE_TEMPLATE.md

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+#### Affected Version
+
+<!-- Use yay -V to get installed version -->
+
+<!-- Example: `yay v3.373` -->
+
+#### Affected Command
+
+<!-- if applies -->
+
+<!-- Example: yay -Syu -->
+
+<!-- Example: yay -S yay-bin -->
+
+#### Expected Results
+
+<!-- Example: Package installed successfully -->
+
+#### Actual Results
+
+<!-- Example: Error is thrown -->