Added the Fish Shell Language

Author: Undalevein

docs/resources/fish-logo-24.png

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+<img src="https://raw.githubusercontent.com/rtoal/polyglot/master/docs/resources/fish-logo-64.png">
+
+# Fish Explorations:
+
+To begin coding in Fish, you will need to install the shell Fish. Here are some of the options you can do to install
+
+**MacOS/Linux Installation**:
+
+Homebrew:
+
+```sh
+brew install fish
+```
+
+**Windows**:
+
+In Msys2 Shell, type:
+
+```sh
+pacman -S fish
+```
+
+After downloading, go to the folder for Msys2 and navigate to usr then bin. There, you should see the `fish.exe` file inside the folder. Then, copy the path and add it to your environmental variables.
+
+If you are struggling to install the shell, then you can go to the [Fish Homepage](https://fishshell.com/) for more options.
+
+Once you have installed fish, you can run the example fish files using the following command:
+
+```
+fish hello.fish
+```
+
+## About Fish:
+
+Fish, also known as the **F**riendly **I**nterface **SH**ell, and like the name sggests, it aims to be a smart and user-friendly command line shell for Linux and macOS. It claims to add more convenient features that other shells may not have built-in, such as type autosuggestion, syntax highlighting, abbreiations, and more, allowing users to be more productive within their command line terminal.
+
+## Fish Resources:
+
+Continue your study of Fish via:
+
+- [Fish Homepage](https://fishshell.com/)
+- [Fish Documentation](https://fishshell.com/docs/current/index.html)
+- [Fish GitHub](https://github.com/fish-shell/fish-shell)

docs/resources/fish-logo-240.png

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+for i in (seq 0 10)
+    set t (math floor \(\(43200 x $i + 21600\) / 11\))
+    set h (math floor $t / 3600 )
+    set m (math floor $t / 60 % 60)
+    set s (math $t % 60)
+    if test $h -eq 0 
+        set h 12 
+    end
+    printf "%02d:%02d:%02d\n" $h $m $s
+end

docs/resources/fish-logo-64.png

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+echo Hello, World!

fish/README.md

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+function Assert-MatchTests {
+    param (
+        [Parameter(Mandatory = $true, ValueFromPipeline)] $TestResult
+    )
+
+    if ($null -ne $TestResult) {
+        Write-Error "Output does not match expected results."
+    }
+}
+
+$Error.clear()
+fish "$PSScriptRoot\clockhands.fish" |
+    Compare-Object (Get-Content "$PSScriptRoot\..\test\clockhands_expected") |
+    Assert-MatchTests &&
+fish "$PSScriptRoot\hello.fish" &&
+fish "$PSScriptRoot\triple.fish" |
+    Compare-Object (Get-Content "$PSScriptRoot\..\test\triple_expected") |
+    Assert-MatchTests &&
+ForEach-Object 'foo';
+
+if ($Error -or !$?) {
+    "*** FISH TESTS FAILED ***"
+}
+else {
+    "FISH TESTS PASSED"
+}

fish/clockhands.fish

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+for c in (seq 40)
+    for b in (seq (math $c - 1))
+        for a in (seq (math $b - 1))
+            if test (math $a ^ 2 + $b ^ 2) -eq (math $c ^ 2)
+                echo $a, $b, $c
+            end
+        end
+    end
+end