Merge pull request #122 from snshn/adr-timeout

Introduce ADR 0003-network-request-timeout.md

docs/adr/0003-network-request-timeout.md

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+# 2. Network request timeout
+
+Date: 2020-02-15
+
+## Status
+
+Accepted
+
+## Context
+
+A slow network connection and overloaded server may negatively impact network response time.
+
+## Decision
+
+Make the program simulate behavior of popular web browsers and CLI tools, where 
+the default network response timeout is most often set to 120 seconds.
+
+Instead of featuring retries for timed out network requests, the program
+should have an option to adjust the timeout length, along with making it
+indefinite when given "0" as its value.
+
+## Consequences
+
+The user is able to retrieve resources that have long response time, as well as obtain
+full control over how soon, and if at all, network requests should time out.