Add ADR for axios

doc/architecture-decisions/ADR-011.md

@@ -0,0 +1,19 @@
+# ADR 11: Axios for calls to the Jira API
+
+## Status
+
+accepted
+
+## Context
+
+We want to be able to configure the headers, base URL and other parameters once for Jira API calls, instead of each time we make a call as previous with the `fetch` and `cross-fetch` packages.
+
+## Decision
+
+We are now using [Axios](https://axios-http.com/docs/intro), a package that enables creation of REST clients and enables us to configure defaults for each call.
+Additionally, we are able to define error handlers for specific HTTP error calls, enabling default error handling for e.g. 401 responses.
+
+## Consequences
+
+Every call to the Jira Server API (except for authorization calls to e.g. fetch a token) should be made via an Axios instance.
+This also means rewriting the error handling in each call, finding common errors and enabling default handling for them.