Add documentation, CI workflow

.github/workflows/Documentation.yml

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+name: Documentation
+
+on:
+  push:
+    branches:
+      - master
+    tags: '*'
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: '1'
+      - name: Install dependencies
+        run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
+      - name: Build and deploy
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # For authentication with GitHub Actions token
+          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }} # For authentication with SSH deploy key
+        run: julia --project=docs/ --code-coverage=user docs/make.jl
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info

docs/.gitignore

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+build/
+site/

docs/Project.toml

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+[deps]
+SymbolicIndexingInterface = "2efcf032-c050-4f8e-a9bb-153293bab1f5"
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+
+[compat]
+Documenter = "0.27"
+SymbolicIndexingInterface = "0.1"

docs/make.jl

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+using Documenter, SymbolicIndexingInterface
+
+cp("./docs/Manifest.toml", "./docs/src/assets/Manifest.toml", force = true)
+cp("./docs/Project.toml", "./docs/src/assets/Project.toml", force = true)
+
+include("pages.jl")
+
+makedocs(
+    sitename="SymbolicIndexingInterface.jl",
+    authors="Chris Rackauckas",
+    modules=[SymbolicIndexingInterface],
+    clean=true,doctest=false,
+    format = Documenter.HTML(analytics = "UA-90474609-3",
+                             assets = ["assets/favicon.ico"],
+                             canonical="https://docs.sciml.ai/SymbolicIndexingInterface/stable/"),
+    pages=pages
+)
+
+deploydocs(
+   repo = "github.com/SciML/SymbolicIndexingInterface.jl.git";
+   push_preview = true
+)

docs/pages.jl

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+# Put in a separate page so it can be used by SciMLDocs.jl
+
+pages=[
+    "Home" => "index.md",
+    "API" => "api.md",
+]

docs/src/api.md

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+# Interface Functions
+
+```@docs
+independent_variables
+is_indep_sym
+states
+state_sym_to_index
+is_state_sym
+parameters
+param_sym_to_index
+is_param_sym
+```
+
+## Concrete Types
+
+```@docs
+SymbolCache
+```

docs/src/index.md

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+# SymbolicIndexingInterface.jl: Arrays of Arrays and Even Deeper
+
+SymbolicIndexingInterface.jl is a set of interface functions for handling containers
+of symbolic variables. It also contains one such container: `SymbolCache`.
+
+## Installation
+
+To install SymbolicIndexingInterface.jl, use the Julia package manager:
+
+```julia
+using Pkg
+Pkg.add("SymbolicIndexingInterface")
+```
+
+## Contributing
+
+- Please refer to the
+  [SciML ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://github.com/SciML/ColPrac/blob/master/README.md)
+  for guidance on PRs, issues, and other matters relating to contributing to SciML.
+- There are a few community forums:
+    - the #diffeq-bridged channel in the [Julia Slack](https://julialang.org/slack/)
+    - [JuliaDiffEq](https://gitter.im/JuliaDiffEq/Lobby) on Gitter
+    - on the [Julia Discourse forums](https://discourse.julialang.org)
+    - see also [SciML Community page](https://sciml.ai/community/)
+
+## Reproducibility
+```@raw html
+<details><summary>The documentation of this SciML package was built using these direct dependencies,</summary>
+```
+```@example
+using Pkg # hide
+Pkg.status() # hide
+```
+```@raw html
+</details>
+```
+```@raw html
+<details><summary>and using this machine and Julia version.</summary>
+```
+```@example
+using InteractiveUtils # hide
+versioninfo() # hide
+```
+```@raw html
+</details>
+```
+```@raw html
+<details><summary>A more complete overview of all dependencies and their versions is also provided.</summary>
+```
+```@example
+using Pkg # hide
+Pkg.status(;mode = PKGMODE_MANIFEST) # hide
+```
+```@raw html
+</details>
+```
+```@raw html
+You can also download the 
+<a href="
+```
+```@eval
+using TOML
+version = TOML.parse(read("../../Project.toml",String))["version"]
+name = TOML.parse(read("../../Project.toml",String))["name"]
+link = "https://github.com/SciML/"*name*".jl/tree/gh-pages/v"*version*"/assets/Manifest.toml"
+```
+```@raw html
+">manifest</a> file and the
+<a href="
+```
+```@eval
+using TOML
+version = TOML.parse(read("../../Project.toml",String))["version"]
+name = TOML.parse(read("../../Project.toml",String))["name"]
+link = "https://github.com/SciML/"*name*".jl/tree/gh-pages/v"*version*"/assets/Project.toml"
+```
+```@raw html
+">project</a> file.
+```