Add shell completions and README to build script

BUILD.md

@@ -0,0 +1,30 @@
+## Executable
+Unpack the archive relevant to your machine and place in $PATH
+
+## Shell Completion Scripts
+
+### Bash
+
+    mkdir -p ~/.config/exercism
+    mv ./exercism_completion.bash ~/.config/exercism/exercism\exercism_completion.bash
+
+Load the completion in your `.bashrc`, `.bash_profile` or `.profile` by
+adding the following snippet:
+
+    if [ -f ~/.config/exercism/exercism_completion.bash ]; then
+      source ~/.config/exercism/exercism_completion.bash
+    fi
+
+### Zsh
+
+    mkdir -p ~/.config/exercism
+    mv ./exercism_completion.zsh ~/.config/exercism/exercism_completion.zsh
+
+Load up the completion in your `.zshrc`, `.zsh_profile` or `.profile` by adding
+the following snippet
+
+    if [ -f ~/.config/exercism/exercism_completion.zsh ]; then
+      source ~/.config/exercism/exercism_completion.zsh
+    fi
+
+**Note:** If you are using the popular [oh-my-zsh](https://github.com/robbyrussell/oh-my-zsh) framework to manage your zsh plugins, you don't need to add the above snippet, all you need to do is create a file `exercism_completion.zsh` inside the `~/.oh-my-zsh/custom`.

bin/build-all

@@ -13,6 +13,15 @@ ARMVAR=github.com/exercism/cli/cmd.BuildARM
 # handle alternate binary name for pre-releases
 BINNAME=${NAME:-exercism}
 
+get_shell_completions() {
+        SHELLCOMP_BASEURL=http://cli.exercism.io/shell/exercism_completion
+        curl -O $SHELLCOMP_BASEURL.bash -O $SHELLCOMP_BASEURL.zsh
+}
+
+cleanup() {
+        rm -f exercism_completion.bash exercism_completion.zsh
+}
+
 createRelease() {
 	os=$1
 	arch=$2
@@ -66,13 +75,15 @@ createRelease() {
 
 	if [ "$osname" = windows ]
 	then
-		zip "$relname.zip" "$binname"
+		zip "$relname.zip" "$binname" ../exercism_completion* ../BUILD.md
 	else
-		tar cvzf "$relname.tgz" "$binname"
+		tar cvzf "$relname.tgz" "$binname" ../exercism_completion* ../BUILD.md
 	fi
 	cd ..
 }
 
+get_shell_completions
+
 # Mac Releases
 createRelease darwin 386
 createRelease darwin amd64
@@ -101,3 +112,5 @@ createRelease linux arm64
 # Windows Releases
 createRelease windows 386
 createRelease windows amd64
+
+cleanup