Merge pull request #30 from EventideSystems/1-project-setup-c4-system…

…-context

1 very basic system context

docs/architecture/system_context.md

@@ -0,0 +1,25 @@
+### System Context
+
+```mermaid
+  C4Context
+    title System Context diagram for Obsekio
+
+    System_Ext(email_system, "E-Mail System", "Transactional email system")
+
+    Enterprise_Boundary(b0, "Application Boundary") {
+
+      Person(UserA, "User", "A checklist user")
+      Person(UserB, "Editor", "A checklist editor")
+
+      System(SystemA, "Application Server", "Allows users to access and manage checklists.")
+
+      SystemDb(SystemB, "Checklist Database", "PostgreSQL database containing checklist data")
+
+      BiRel(UserA, SystemA, "Uses")
+      BiRel(UserB, SystemA, "Uses")
+      BiRel(SystemA, SystemB, "Uses")
+
+      Rel(SystemA, email_system, "Sends e-mails to")
+    }
+
+```