Documentation: Add backlog.md

backlog.md

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+# Backlog
+
+## Iteration +1
+- Make schema **and** table name configurable
+- Regular expressions not working
+  - https://github.com/crate/cratedb-prometheus-adapter/issues/24
+  - https://prometheus.io/docs/prometheus/latest/querying/basics/
+  - https://prometheus.io/docs/prometheus/latest/querying/examples/
+- Expose metrics about both database connection pools
+  https://github.com/crate/cratedb-prometheus-adapter/pull/105
+
+## Iteration +2
+- Document how to connect to CrateDB Cloud
+- Improve documentation
+  https://community.crate.io/t/storing-long-term-metrics-with-prometheus-in-cratedb/1012
+
+## Iteration +3
+- Add more defaults from xxx
+- Adjust default timeout values to best practices
+- Dissolve discrete connection parameters, use connection string only
+- Check how configuration per environment variables works
+- Think about using `prometheus.Labels` instead of metric prefixes
+- Also prepare SQL statement used for reading?
+- Refactor metric names
+  > Generated/dynamic metric names are a sign that you should be using labels instead.
+  > -- https://prometheus.io/docs/instrumenting/writing_clientlibs/#metric-names