Created Install (markdown)

Install.md

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+# Installation
+
+## Environment
+
+```
+symfony check:requirements
+```
+
+## Production
+
+Install stable release
+
+```
+composer create-project yggverse/yggtracker
+```
+
+## Development
+
+Latest codebase available in repository
+
+```
+git clone https://github.com/YGGverse/YGGtracker.git
+cd YGGtracker
+composer update
+symfony server:start
+```
+
+## Database
+
+New installation
+
+```
+php bin/console doctrine:schema:update --force
+```
+
+Existing DB upgrade
+
+```
+php bin/console doctrine:migrations:migrate
+```
+
+## Last steps
+
+* [Nginx](https://github.com/YGGverse/YGGtracker/wiki/Nginx)
+* [Crontab](https://github.com/YGGverse/YGGtracker/wiki/Nginx)