Add some diagrams to help developers

README.md

@@ -42,6 +42,9 @@ https://www.transifex.com/projects/p/k9mail/
 
 ## Contributing
 
+Thank you for contributing! If you're unfamiliar with the code, 
+start by reading the [developer documentation](docs/DESIGN.md)
+
 Please fork this repository and contribute back using [pull requests](https://github.com/k9mail/k-9/pulls).
 
 Any contributions, large or small, major features, bug fixes, unit/integration tests are welcomed and appreciated

docs/DESIGN.md

@@ -0,0 +1,36 @@
+# Repository structure
+
+The project is divided into several directories below which are nested gradle projects.
+
+## app
+
+This contains the highest level code such as UI and core logic.
+
+## backend
+
+APIs for sending and receiving messages
+
+## mail
+
+Low level code for dealing with internet mail protocols
+
+## plugins
+
+Additional, standalone, libraries used by K-9
+
+![modules](Modules.png)
+
+# Walkthrough
+
+To help you understand the design, the following sequence diagrams show typical flows through the
+classes. Each class is colour-coded by its top-level project. 
+
+## Reading email
+
+![read email sequence](ReadEmail.png)
+
+![read email classes](ReadEmailClasses.png)
+
+## Sending email
+
+![send email sequence](SendEmail.png)

docs/draw.io/CreateAccount.xml

@@ -0,0 +1 @@
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docs/draw.io/ImportExport.xml

@@ -0,0 +1 @@
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docs/draw.io/Modules.xml

@@ -0,0 +1 @@
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docs/draw.io/README.md

@@ -0,0 +1 @@
+This folder is for the draw.io raw source for the SVGs in the parent directory

docs/draw.io/ReadEmail.xml

@@ -0,0 +1 @@
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docs/draw.io/ReadEmailClasses.xml

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docs/draw.io/SendEmail.xml

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