feat: add Mastarm setup

doc/mastarm.md

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+# Setup Mastarm
+
+* install [Node](node.md)
+
+* check if Npm is successfully installed
+```
+npm -v
+```
+
+* install Mastarm using Npm
+```
+npm i -g mastarm
+```
+
+* verify that Mastarm is installed sccessfully
+```
+mastarm -V
+```

doc/mastarm.md.license

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+/*
+ * SPDX-FileCopyrightText: 2022 Software Ingenieur Begerad <swingbe.de>
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */