Add documentation

README.md

@@ -1,8 +1,54 @@
 # perftests-quarkus
 
-This project uses Quarkus, the Supersonic Subatomic Java Framework.
+This is a test for Quarkus to handle large projets, in quantity of objects to manage.
 
-If you want to learn more about Quarkus, please visit its website: <https://quarkus.io/>.
+To use this project, you have to generate the _actual_ code:
+
+1. Set the root path in `src/main/java/fr/spacefox/perftests/quarkus/generator/Generator.java` constant `ROOT_PATH` to
+   the _actual_ path of your project sources.
+2. You may change the number of elements to generate with `ELEMENTS` in the same file.
+3. Run the Generator: now you have a giant Quarkus project ready to be used!
+4. Build and play! You can keep the tests, they will run in a _reasonable_ amount of time.
+5. You can run some kind of performance tests by using `perfs.jmx` in Apache JMeter
+
+See also [the Spring Boot version](https://git.spacefox.fr/spacefox/perftests-springboot).
+
+Requirements:
+
+- JRE ⩾ 21
+- PostgreSQL (you may use `src/test/docker/compose.yaml`)
+
+**Note: generating too much `ELEMENTS` will not work due to Quarkus internals**.
+Actual limit with this project is somewhere between 4100 and 4200.
+
+Generated arborescence kind of follow the hexagonal / ports & adapters architecture, so Panache ORM is used with its
+repository variant:
+
+```
+fr.spacefox.perftests.quarkus
+    .core
+        .port
+            .data
+                EntityNDatasourcePort.java
+        .serviceN
+            .model
+                ModelN.java
+            ServiceN
+    .data
+        .entityN
+            EntityN.java
+            EntityNRepository.java
+            Mapper.java
+    .rest
+        .endpointN
+            .schema
+                SchemaN.java
+            EndpointNResource.java
+            Mapper.java
++ tests
+```
+
+--------------------------
 
 ## Running the application in dev mode