add ADR describing asset minimization

.adr-dir

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-docs/arch/
+docs/arch

docs/arch/0005-asset-minimization.md

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+# 4. Asset Minimization
+
+Date: 2020-03-14
+
+## Status
+
+Accepted
+
+## Context
+
+It may look like a good idea to make monolith compress retrieved assets while
+saving the page for the purpose of reducing the resulting document's file size.
+
+## Decision
+
+Given that the main purpose of this program is to save pages in a convenient to store and share manner — it's mostly an archiving tool,
+aside from being able to tell monolith to exclude certain types of asests (e.g. images, CSS, JavaScript),
+it would be outside of scope of this program to implement code for compressing assets. Minimizing files before embedding them
+does not reduce the amount of data that needs to be transferred either. A separate tool can be used later to compress and minimize pages
+saved by monolith, if needed.
+
+## Consequences
+
+Monolith will not support modification of original document assets for the purpose of reducing their size, sticking to performing only a minimal
+amount of modifications to the original web page — whatever is needed to provide security or exclude unwanted asset types.