Added completions for npm (#187)

* added npm

* added npm

Co-authored-by: Yethal <nosuchemail@email.com>

custom-completions/npm/README.md

@@ -0,0 +1,5 @@
+# NPM Custom Completions
+
+### Definition
+
+These scripts should be used to demonstrate how create custom completions for npm.

custom-completions/npm/npm-completions.nu

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+export extern "npm" [
+  command: string@"nu-complete npm"
+]
+def "nu-complete npm" [] {
+  ^npm -l
+  |lines
+  |find 'Run "'
+  |str trim
+  |split column -c ' '
+  |get column4
+  |str find-replace '"' ''
+}
+
+def "nu-complete npm run" [] {
+  open ./package.json
+  |get scripts
+  |columns
+}
+
+export extern "npm run" [
+  command: string@"nu-complete npm run"
+  --workspace(-w)
+  --include-workspace-root
+  --if-present
+  --ignore-scripts
+  --script-shell
+]