Created Testing (markdown)

Testing.md

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+If you want to test your updates with the current golang testing units, you can follow the guide below to run a full test process.
+
+## Create Docker Databases
+The easiest way to run the tests on all 3 databases is by starting temporary databases with Docker.
+
+```go
+docker run -it -d -p 3306:3306 mysql
+```
+
+```go
+docker run -it -d -p 5432:5432 postgres
+```
+
+Once you have MySQL and Postgres running, you can begin the testing. SQLite database will create a `statup.db` file and will delete after testing.
+
+## Run Tests
+
+```go
+go test -v
+```