Update marketing-plan.md

docs/70-Sales-and-marketing/marketing-plan.md

 # Template of Marketing Plan
 
-* This is a place holder for template of marketing plan
-
+* Find your target market and focus customer groups
+2. Less is more -  You don't need too many features and functionalitys, but focus on customer's primal needs and use cases
+3. Be small, but agile and use personal point of view
+4. Give something free - Get users inside your solution and part of development
+5. Provide easy way for a test run of product? 
+6. Do marketing by training – By sharing your valuable information you can gain more interest among possible clients
+7. Use blogs and share your story among client
+8. Collect client contacts as emails, but remember to take care of GDPR. Ask permission for sending marketing info in future
+9. Do videos and preliminary demo reviews to gain knowledge what is available already and what is the future of product (Release Plan)