Add example project folder

example/collage

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+(document "main.md"
+
+  {
+    name "rust-sample"
+    dir "s1"
+    cmd [ "cargo clean" "cargo build" ]
+    expose (file "src/main.rs")
+  }
+
+  {
+    name "haskell-sample"
+    dir "s2"
+    cmd [ "cabal new-build" ]
+    expose (sections "Main.hs")
+  }
+
+)

example/main.md

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+Here is the full source of a Rust project:
+
+```rust
+«rust-sample»
+```
+
+And here are the split-apart chunks of a Haskell source file, starting with the header material
+
+```haskell
+«haskell-sample/front-matter»
+```
+
+And the main sources:
+
+```haskell
+«haskell-sample/functions»
+```

example/s1/.gitignore

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+Cargo.lock
+target

example/s1/Cargo.toml

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+[package]
+name = "s1"
+version = "0.1.0"
+authors = ["Getty Ritter <gettylefou@gmail.com>"]
+
+[dependencies]

example/s1/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

example/s2/Main.hs

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+module Main where
+
+main :: IO ()
+main = return ()

example/s2/s2.cabal

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+name: s2
+version: 0.1.0.0
+-- synopsis:
+-- description:
+license: BSD3
+author: Getty Ritter <gettylefou@gmail.com>
+maintainer: Getty Ritter <gettylefou@gmail.com>
+copyright: @2018 Getty Ritter
+-- category:
+build-type: Simple
+cabal-version: >=1.14
+
+executable s2
+  hs-source-dirs: .
+  main-is: Main.hs
+  default-language: Haskell2010
+  ghc-options: -Wall
+  build-depends: base >=4.7 && <5