Add hello world exercism in go

Author: Aadit Kamat

Exercism/go/hello-world/.exercism/config.json

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+{
+  "blurb": "The classical introductory exercise. Just say \"Hello, World!\"",
+  "authors": [
+    "k4rtik"
+  ],
+  "contributors": [
+    "bitfield",
+    "ekingery",
+    "ferhatelmas",
+    "hilary",
+    "kytrinyx",
+    "leenipper",
+    "petertseng",
+    "robphoenix",
+    "SebastianKristof",
+    "sebito91",
+    "tleen"
+  ],
+  "files": {
+    "solution": [
+      "hello_world.go"
+    ],
+    "test": [
+      "hello_world_test.go"
+    ],
+    "example": [
+      ".meta/example.go"
+    ]
+  },
+  "source": "This is an exercise to introduce users to using Exercism",
+  "source_url": "http://en.wikipedia.org/wiki/%22Hello,_world!%22_program"
+}

Exercism/go/hello-world/.exercism/metadata.json

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+{"track":"go","exercise":"hello-world","id":"1feef115cb0546caab11454f7ed1d686","url":"https://exercism.org/tracks/go/exercises/hello-world","handle":"aaditkamat","is_requester":true,"auto_approve":false}

Exercism/go/hello-world/HELP.md

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+# Help
+
+## Running the tests
+
+To run the tests run the command `go test` from within the exercise directory.
+
+If the test suite contains benchmarks, you can run these with the `--bench` and `--benchmem`
+flags:
+
+    go test -v --bench . --benchmem
+
+Keep in mind that each reviewer will run benchmarks on a different machine, with
+different specs, so the results from these benchmark tests may vary.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit hello_world.go` 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 [Go track's documentation](https://exercism.org/docs/tracks/go)
+- [Exercism's support channel on gitter](https://gitter.im/exercism/support)
+- 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 use one of the following resources:
+
+- [How to Write Go Code](https://golang.org/doc/code.html)
+- [Effective Go](https://golang.org/doc/effective_go.html)
+- [Go Resources](http://golang.org/help)
+- [StackOverflow](http://stackoverflow.com/questions/tagged/go)

Exercism/go/hello-world/README.md

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+# Hello World
+
+Welcome to Hello World on Exercism's Go 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!"](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program) is
+the traditional first program for beginning programming in a new language
+or environment.
+
+The objectives are simple:
+
+- Write a function that returns 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.
+
+## Source
+
+### Created by
+
+- @k4rtik
+
+### Contributed to by
+
+- @bitfield
+- @ekingery
+- @ferhatelmas
+- @hilary
+- @kytrinyx
+- @leenipper
+- @petertseng
+- @robphoenix
+- @SebastianKristof
+- @sebito91
+- @tleen
+
+### Based on
+
+This is an exercise to introduce users to using Exercism - http://en.wikipedia.org/wiki/%22Hello,_world!%22_program

Exercism/go/hello-world/go.mod

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+module greeting
+
+go 1.16

Exercism/go/hello-world/hello_world.go

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+package greeting
+
+// HelloWorld greets the world.
+func HelloWorld() string {
+	return "Hello, World!"
+}

Exercism/go/hello-world/hello_world_test.go

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+package greeting
+
+import "testing"
+
+// Define a function named HelloWorld that takes no arguments,
+// and returns a string.
+// In other words, define a function with the following signature:
+// HelloWorld() string
+
+func TestHelloWorld(t *testing.T) {
+	expected := "Hello, World!"
+	if observed := HelloWorld(); observed != expected {
+		t.Fatalf("HelloWorld() = %v, want %v", observed, expected)
+	}
+}
+
+// BenchmarkHelloWorld() is a benchmarking function. These functions follow the
+// form `func BenchmarkXxx(*testing.B)` and can be used to test the performance
+// of your implementation. They may not be present in every exercise, but when
+// they are you can run them by including the `-bench` flag with the `go test`
+// command, like so: `go test -v --bench . --benchmem`
+//
+// You will see output similar to the following:
+//
+// BenchmarkHelloWorld   	2000000000	         0.46 ns/op
+//
+// This means that the loop ran 2000000000 times at a speed of 0.46 ns per loop.
+//
+// While benchmarking can be useful to compare different iterations of the same
+// exercise, keep in mind that others will run the same benchmarks on different
+// machines, with different specs, so the results from these benchmark tests may
+// vary.
+func BenchmarkHelloWorld(b *testing.B) {
+	if testing.Short() {
+		b.Skip("skipping benchmark in short mode.")
+	}
+	for i := 0; i < b.N; i++ {
+		HelloWorld()
+	}
+}