Updates the building instructions

Building.md

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+Notes for Building Insight
+===============================================
+
+Now with Insight 6.0, we DO support .NET Core and no longer support databases that require funky driver installs.
+It makes it a lot easier.
+
+
+# Docker for Test Databases #
+
+You can run all of the supported databases through docker:
+
+	cd insight-docker
+	.\docker-env.bat # windows
+	source ./docker-env.bat # non-windows
+	docker-compose up
+
+It takes a while the first time, so wait until all of the databases boot up fully.
+
+NOTE: `docker-env` will set the `INSIGHT_TEST_HOST` and `INSIGHT_TEST_PASSWORD` environment variables. You'll need them
+for any process that is running the tests and needs to connect to the database.
+
+# Command-Line Builds #
+
+On Windows, you can use the powershell scripts in the root folder:
+
+	./build.ps1 build
+	./build.ps1 test
+	./build.ps1 package
+
+On non-Windows, you can use the `dotnet build` and `dotnet test` command for anything you want to build and run.
+You'll want to specify the framework with `-f <framework>` so you don't try to build frameworks that you don't have.
+
+	dotnet build Insight.Database/Insight.Database.csproj -f netstandard2.0
+	dotnet test Insight.Tests/Insight.Tests.csproj -f netcoreapp2.0
+
+# Tagging a Version #
+
+1. Update the version number in SharedConfiguration.csproj.
+2. Use `git tag <version>` to mark the changeset.
+3. `build package` to make the build.
+4. `git push --tags` to push the tags to the server.