Initial docs

Author: willtebbutt

docs/Project.toml

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+[deps]
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+Libtask = "6f1fad26-d15e-5dc8-ae53-837a1d7b8c9f"

docs/make.jl

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+using Documenter, Libtask
+
+makedocs(sitename="Libtask")

docs/src/index.md

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+# Libtask
+
+Libtask is best explained by the docstring for [`TapedTask`](@ref):
+```@docs; canonical=true
+Libtask.TapedTask
+```
+
+The functions discussed the above docstring (in addition to [`TapedTask`](@ref) itself) form the
+public interface of Libtask.jl.
+They divide neatly into two kinds of functions: those which are used to construct and
+manipulate [`TapedTask`](@ref)s, and those which are intended to be used _inside_ a
+[`TapedTask`](@ref).
+
+First, manipulation of [`TapedTask`](@ref)s:
+```@docs; canonical=true
+Libtask.consume
+Base.copy(::Libtask.TapedTask)
+Libtask.set_dynamic_scope!
+```
+
+The functions which enable special functionality inside a [`TapedTask`](@ref)s are:
+```@docs; canonical=true
+Libtask.produce
+Libtask.get_dynamic_scope
+```