chore: add root tsconfig (#2109)

Author: wemeetagain

tsconfig.json

@@ -0,0 +1,6 @@
+// This root tsconfig allows the linter to work properly in vscode
+// It is not used to build subpackages
+{
+  "extends": "aegir/src/config/tsconfig.aegir.json",
+  "include": ["packages/**/*.ts"]
+}