Add docstring to Path

Author: asinghvi17

src/path.jl

@@ -1,8 +1,23 @@
+"""
+    struct Path{T}
+
+A `Path` is a sequence of `PathChange`s, beginning from some `initialview::ViewState`.
+It is callable with a single parameter `t`, which is the time since the start of the path at `t=0`.
+It returns the `ViewState` at time `t`.
+
+To add a new `PathChange` to a `Path`, use the `*` operator.  This is non-mutating and will construct a new path!
+"""
 struct Path{T}
     initialview::ViewState{T}
     changes::Vector{PathChange{T}}
 end
 Path{T}(initialview::ViewState) where T = Path{T}(initialview, PathChange{T}[])
+
+"""
+    Path(initialview::ViewState{T}) where T
+
+Construct a `Path` that starts at `initialview`.
+"""
 Path(initialview::ViewState{T}) where T = Path{T}(initialview)
 
 function Base.:*(path::Path{R}, change::PathChange{S}) where {R,S}