docs: add asciidoc docs for use with refinedsites

docs/pages/input-and-output/interface.adoc

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+= Interface
+:icon: interface.png
+:from: v0.4.0-alpha
+
+The Interface is a block that acts as a combination of the xref:importer.adoc[] and the xref:exporter.adoc[].
+
+== Importing
+
+Let's talk about the difference between an xref:importer.adoc[] and the Interface for importing.
+
+The xref:importer.adoc[] needs to be connected to an inventory to import items or fluids.
+It has no internal inventory and you can't insert items directly to the xref:importer.adoc[.
+
+In comparison with the xref:importer.adoc[] the Interface has an internal inventory to receive items and import them (through piping, hoppers, etc).
+That internal inventory is accessible by opening the GUI and looking at the slots under "Interface Import").
+
+The Interface does NOT extract items from adjacent inventories automatically, you have to actually insert them in the Interface through piping, hoppers, etc.
+
+== Exporting
+
+There is also an option for exporting items from the system.
+These items can be piped out through a piping system from another mod, hoppers, etc.
+
+It can be configured to be NBT or damage sensitive.
+
+== Output configuration
+
+- Click an item in the export slots to configure that to be exported.
+- Use left or right click on the item to change the amount.
+- Use shift to clear the slot.
+
+== Applicable upgrades
+
+- xref:../upgrades/speed-upgrade.adoc[]
+- xref:../upgrades/stack-upgrade.adoc[]
+- xref:../upgrades/crafting-upgrade.adoc[]