update docs

docs/install.md

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+# Install NPMTS
+First install npmts globally, then install the npmts-g locally.
+
+> **npmts-g* checks if the global version of npmts suffices the modules requirements.
+If not it installs npmts locally in the right version during npm install. 
+
+```sh
+npm install npmts -g # installs npmts globally
+npm install npmts-g --save-dev # installs npmts-g checking tool as devDependency
+```
+
+Then add it to your package.json's script section to trigger a build:
+
+```json
+"scripts": {
+    "test": "(npmts)"
+}
+```