Add example project

Author: joshuanianji

example/.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/debian
+{
+    "name": "Idris2 Devcontainer",
+    "image": "ghcr.io/joshuanianji/idris-2-docker/devcontainer:v0.7.0",
+    "features": {
+        "ghcr.io/devcontainers/features/common-utils:2": {}
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "bamboo.idris2-lsp"
+            ]
+        }
+    }
+    // Features to add to the dev container. More info: https://containers.dev/features.
+    // "features": {},
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+    // Configure tool-specific properties.
+    // "customizations": {},
+    // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+    // "remoteUser": "root"
+}

example/.gitignore

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+build

example/README.md

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+# Hello World
+
+This is a simple hello-world example using Idris 0.7, taken from the [Getting Started Guide](https://idris2.readthedocs.io/en/latest/tutorial/starting.html).
+
+To start, open the example folder in vscode and run `Reopen in Container` from the command palette.
+
+Once the container is running, you can play with Idris2!
+
+```bash
+$ idris2 hello.idr
+     ____    __     _         ___
+    /  _/___/ /____(_)____   |__ \
+    / // __  / ___/ / ___/   __/ /     Version 0.7.0
+  _/ // /_/ / /  / (__  )   / __/      https://www.idris-lang.org
+ /___/\__,_/_/  /_/____/   /____/      Type :? for help
+
+Welcome to Idris 2.  Enjoy yourself!
+Main> :t main
+Main.main : IO ()
+Main> :c hello main
+File build/exec/hello written
+Main> :q
+Bye for now!
+```

example/hello.idr

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+module Main
+
+main : IO ()
+main = putStrLn "Hello world"

example/hello.ipkg

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+package hello
+-- version =
+-- authors =
+-- maintainers =
+-- license =
+-- brief =
+-- readme =
+-- homepage =
+-- sourceloc =
+-- bugtracker =
+
+-- the Idris2 version required (e.g. langversion >= 0.5.1)
+-- langversion
+
+-- packages to add to search path
+-- depends =
+
+-- modules to install
+modules = README
+
+-- main file (i.e. file to load at REPL)
+-- main =
+
+-- name of executable
+-- executable =
+-- opts =
+-- sourcedir =
+-- builddir =
+-- outputdir =
+
+-- script to run before building
+-- prebuild =
+
+-- script to run after building
+-- postbuild =
+
+-- script to run after building, before installing
+-- preinstall =
+
+-- script to run after installing
+-- postinstall =
+
+-- script to run before cleaning
+-- preclean =
+
+-- script to run after cleaning
+-- postclean =