Add foundational AL developer knowledge (#195)

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/upgrade/install-and-upgrade-codeunits-have-no-order.good.al

@@ -0,0 +1,18 @@
+codeunit 50640 "Sample Upgrade Good"
+{
+    Subtype = Upgrade;
+
+    trigger OnUpgradePerCompany()
+    begin
+        CreateUpgradeState();
+        MigrateDependentData();
+    end;
+
+    local procedure CreateUpgradeState()
+    begin
+    end;
+
+    local procedure MigrateDependentData()
+    begin
+    end;
+}