feat(r): hello world

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

r/hello-world/.exercism/config.json

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+{
+  "authors": [
+    "jonboiser"
+  ],
+  "contributors": [
+    "jonmcalder",
+    "katrinleinweber",
+    "ttnagata",
+    "zacchaeusluke"
+  ],
+  "files": {
+    "solution": [
+      "hello-world.R"
+    ],
+    "test": [
+      "test_hello-world.R"
+    ],
+    "example": [
+      ".meta/example.R"
+    ]
+  },
+  "blurb": "Exercism's classic introductory exercise. Just say \"Hello, World!\".",
+  "source": "This is an exercise to introduce users to using Exercism",
+  "source_url": "https://en.wikipedia.org/wiki/%22Hello,_world!%22_program"
+}

r/hello-world/.exercism/metadata.json

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+{"track":"r","exercise":"hello-world","id":"070beed7e22445ff9d08d9d1b48ff931","url":"https://exercism.org/tracks/r/exercises/hello-world","handle":"cafkafk","is_requester":true,"auto_approve":false}

r/hello-world/HELP.md

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+# Help
+
+## Running the tests
+
+Tests require the `{testthat}` package to be installed in R.
+To run the tests for an exercise, simply execute the `test_<exercise_name>.R` script from within the exercise's directory.
+
+This can be conveniently done with [testthat's `auto_test` function](https://testthat.r-lib.org/reference/auto_test.html). Because exercism code and tests are in the same folder, use this same path for both `code_path` and `test_path` parameters. On the command-line, you can also run `Rscript test_<exercise_name>.R`.
+
+See the [tests page](https://exercism.org/docs/tracks/r/tests) for more information.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit hello-world.R` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [R track's documentation](https://exercism.org/docs/tracks/r)
+- The [R track's programming category on the forum](https://forum.exercism.org/c/programming/r)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can try one of the following resources:
+
+- [StackOverflow](https://stackoverflow.com/questions/tagged/r) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.
+- [#rstats](https://twitter.com/search?q=%23rstats) is the hashtag to use if you are asking for help or guidance on Twitter. The R community is very active on Twitter and always try to help those who are new to R.
+- [/r/rstats](https://www.reddit.com/r/rstats) is the R subreddit.
+- [RStudio Community](https://community.rstudio.com/) is another active and helpful R community.

r/hello-world/README.md

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+# Hello World
+
+Welcome to Hello World on Exercism's R Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+The classical introductory exercise.
+Just say "Hello, World!".
+
+["Hello, World!"][hello-world] is the traditional first program for beginning programming in a new language or environment.
+
+The objectives are simple:
+
+- Modify the provided code so that it produces the string "Hello, World!".
+- Run the test suite and make sure that it succeeds.
+- Submit your solution and check it at the website.
+
+If everything goes well, you will be ready to fetch your first real exercise.
+
+[hello-world]: https://en.wikipedia.org/wiki/%22Hello,_world!%22_program
+
+## Source
+
+### Created by
+
+- @jonboiser
+
+### Contributed to by
+
+- @jonmcalder
+- @katrinleinweber
+- @ttnagata
+- @zacchaeusluke
+
+### Based on
+
+This is an exercise to introduce users to using Exercism - https://en.wikipedia.org/wiki/%22Hello,_world!%22_program

r/hello-world/hello-world.R

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+hello_world <- function() {
+  "Hello, World!"
+}

r/hello-world/test_hello-world.R

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+source("./hello-world.R")
+library(testthat)
+
+test_that("no name", {
+  expect_equal(hello_world(), "Hello, World!")
+})