Add simple issue tracking system.

doc/issues/open/000-provide-options-for-graphing-measurements.md

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+### Provide options for graphing measures.
+
+As a user I would like to be able to configure the graph used for a measure.
+
+Needed:
+- General pattern for graph configuration.
+- Support for different graph types (line, bar, pie, area, others?).
+- Support for pre-processing of data (graph rolling average, etc).

doc/issues/open/001-add-a-timestamp-meaure-type-(no-value).md

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+### Add a timestamp meaure type (no value).
+
+As a user I would like to be able to measure when things happen (fall asleep)
+with a simple timestamp.
+
+#### Implementation notes:
+
+This may not require a new storage type (just use the existing SimpleMeasure)
+but UI (input, graphs, etc.) would just ignore the value and only consider the
+timestamp.

doc/issues/open/002-add-support-for-text-entries.md

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+### Add support for text entries.
+
+Thinking is to allow recording an arbitrary text value alonside a timestamp.
+Presentation would be something like a list of the values. Probably no graph
+(maybe something like a histogram for some use cases?).