docs: add a decision log

Sponsored-by: author

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+# Big decisions made by the Obnam project
+
+This is a decision log of big decisions, often architectural ones, or
+otherwise decisions that impact the project as a whole. They may be
+decisions about non-technical aspects of the project.
+
+Decisions should be discussed before being made so that there is a
+strong consensus for them. Decisions can be changed or overturned if
+they turn out to no longer be good. Overturning is itself a decision.
+
+Each decision should have its own heading. Newest decision should come
+first. Updated or overturned decisions should have their section
+updated to note their status, without moving them.
+
+## Start a decision log
+
+Date: 2021-11-30
+
+What: We decided to start keeping a decision log.
+
+Who: Alexander Batischev, Lars Wirzenius.