Merge pull request modflowpy#34 from wpbonelli/c4

draft c4 diagrams https://c4model.com/

docs/dev/c4.md

@@ -0,0 +1,104 @@
+# FloPy C4 diagrams
+
+Documenting prospective FloPy architecture.
+
+```mermaid
+C4Context
+  title [Context] FloPy / MF6
+
+  Enterprise_Boundary(ec, "EC Framework") {
+    Person(hydrologist, "Hydrologist", "determines optimal pumping rate for well field")
+    Person(student, "Student", "simulates salt water intrusion in coastal aquifer")
+    Person(professor, "Professor", "teaches groundwater modeling course")
+    Person(institution, "Lab/Institution", "maintains pre-/post-processing extensions")
+    Person(developer, "Developer", "debugs issues, develops features/models")
+
+    System(flopy, "FloPy")
+    System(mf6, "MODFLOW 6")
+
+    Rel(flopy, mf6, "wraps")
+    Rel(hydrologist, flopy, "uses")
+    Rel(student, flopy, "uses")
+    Rel(professor, flopy, "uses")
+    Rel(institution, flopy, "extends")
+    Rel(developer, flopy, "develops")
+    UpdateRelStyle(hydrologist, flopy, $lineColor="blue")
+    UpdateRelStyle(student, flopy, $lineColor="blue")
+    UpdateRelStyle(professor, flopy, $lineColor="blue")
+    UpdateRelStyle(institution, flopy, $lineColor="blue", $offsetX="-190", $offsetY="10")
+    UpdateRelStyle(developer, flopy, $lineColor="blue")
+
+  }
+
+```
+
+```mermaid
+C4Container
+  title [Containers] FloPy / MF6
+
+  Enterprise_Boundary(ec, "EC Framework") {
+
+    Boundary(mf6, "MODFLOW 6"){
+      SystemDb(dfn, "Definition files")
+    }
+
+    Boundary(flopy, "FloPy") {
+      Boundary(devs, "Developer APIs") {
+        System(fpycodegen, "Code generation")
+        System(fpycore, "Core framework")
+      }
+      Boundary(users, "User APIs") {
+          System(fpymf6, "MODFLOW 6 module")
+          System(fpyprepost, "Pre-/post-processing")
+      }
+      Rel(fpymf6, fpycore, "imports")
+      Rel(fpyprepost, fpycore, "imports")
+    
+      Rel(fpycodegen, dfn, "inspects")
+      Rel(fpycodegen, fpymf6, "generates")
+    }
+
+    Person(dev, "Developer", "")
+    Person(user, "User", "")
+
+    Rel(dev, dfn, "develops")
+    Rel(dev, fpycore, "develops")
+    Rel(dev, fpycodegen, "uses")
+    Rel(user, fpymf6, "uses")
+    Rel(user, fpyprepost, "uses")
+    UpdateRelStyle(dev, dfn, $lineColor="blue", $offsetX="-20" $offsetY="-30")
+    UpdateRelStyle(dev, fpycore, $lineColor="blue", $offsetY="90")
+    UpdateRelStyle(dev, fpycodegen, $lineColor="blue", $offsetY="50")
+    UpdateRelStyle(user, fpymf6, $lineColor="blue", $offsetY="50")
+    UpdateRelStyle(user, fpyprepost, $lineColor="blue", $offsetY="50")
+    UpdateRelStyle(user, fpycore, $lineColor="blue", $offsetX="-20" $offsetY="-10")
+  }
+
+  UpdateLayoutConfig($c4ShapeInRow="5", $c4BoundaryInRow="5")
+```
+
+```mermaid
+C4Component
+  title [Component] FloPy code generation
+
+  Container_Boundary(fpycodegen, "Code generation") {
+    Component(templates, "Jinja templates")
+    Component(genscript, "Generator script")
+  }
+
+  Container_Boundary(fpymf6, "MF6 module") {
+    Component(comp1, "IDM component 1")
+    Component(comp2, "IDM component 2")
+  }
+
+  Container_Boundary(fpycore, "Core framework") {
+    Component(ctx, "Input contexts")
+  }
+
+  Rel(genscript, templates, "uses")
+  Rel(genscript, comp1, "creates")
+  Rel(genscript, comp2, "creates")
+  Rel(genscript, ctx, "uses")
+  Rel(comp1, ctx, "imports")
+  Rel(comp2, ctx, "imports")
+```