Add a MAINTENANCE.md doc

MAINTENANCE.md

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+# update dependencies
+
+    npm update
+    npm outdated
+
+If new version exist put '*' in `package.json` and run again `npm update`
+
+- new commit with dependency updates
+
+# new release
+
+ - run - npm version patch -m "prepare release %s"
+or
+ - run - npm version minor -m "prepare release %s"
+
+ - push commit
+
+ - checkout release/vX
+ - merge master and push
+ - run
+    npm update
+    npm install
+    npm prune --production
+ - commit and push "update dependency after merge from master"
+ - git tag and git push --tags