adding doc

docs/src/apis.md

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+# API list
+
+```@index
+```
+
+```@autodocs
+Modules = [CoordVisualize]
+```

docs/src/index.md

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+```@meta
+CurrentModule = CoordVisualize
+```
+
+# CoordVisualize.jl
+
+Documentation for CoordVisualize.jl
+
+## Tutorial
+Readers are expected to be familiar with basics of julia.
+
+### Log structure
+CoordVisualize.jl treats coordination trace log with some additional information,
+datetime when log was taken and supplemental note to annotate the log.
+This set of log is represented by the type [`CoordLog`](@ref).
+
+### Parsing Log
+Use [`parse_log`](@ref) to parse log files generated with Tracecoords CSM mod.
+Set the keyword argument `interactive` to `true` to supply notes interactively.
+It automatically get datetime.
+Notes can be also supplied in the following section.
+
+### Editing
+You sometimes want to split logs and to give more appropriate notes for each of them.
+You can do this with [`split_log`](@ref) function.
+
+You can also edit existing notes with [`assign_note!`](@ref).