Merge pull request #4214 from NativeScript/fatme/package-manager-doc

docs: add docs for `package-manager get` and `package-manager set`

Author: rosen-vladimirov

docs/man_pages/general/package-manager-get.md

@@ -0,0 +1,25 @@
+<% if (isJekyll) { %>---
+title: tns package-manager get
+position: 18
+---<% } %>
+
+# tns package-manager get
+
+### Description
+
+Prints the value of the current package manager.
+
+### Commands
+
+Usage | Synopsis
+------|-------
+General | `$ tns package-manager get`
+
+<% if(isHtml) { %>
+
+### Related Commands
+
+Command | Description
+----------|----------
+[package-manager-set](package-manager-set.html) | Enables the specified package manager for the NativeScript CLI. Supported values are npm and yarn.
+<% } %>

docs/man_pages/general/package-manager-set.md

@@ -0,0 +1,29 @@
+<% if (isJekyll) { %>---
+title: tns package-manager set
+position: 17
+---<% } %>
+
+# tns package-manager set
+
+### Description
+
+Enables the specified package manager for the NativeScript CLI. Supported values are npm and yarn.
+
+### Commands
+
+Usage | Synopsis
+------|-------
+General | `$ tns package-manager set <PackageManager>`
+
+### Arguments
+
+* `<PackageManager>` is the name of the package manager. Supported values are npm and yarn.
+
+<% if(isHtml) { %>
+
+### Related Commands
+
+Command | Description
+----------|----------
+[package-manager-get](package-manager-get.html) | Prints the value of the current package manager.
+<% } %>