From c8b7f224fa37a086260a8fdb1e11bad7f84b7d3f Mon Sep 17 00:00:00 2001
From: Oliver Gut <oliver.gut@geowerkstatt.ch>
Date: Fri, 15 Nov 2024 10:02:40 +0100
Subject: [PATCH] Add documentation

---
 src/extern-sync/README.md | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/extern-sync/README.md

diff --git a/src/extern-sync/README.md b/src/extern-sync/README.md
new file mode 100644
index 000000000..d18accf1e
--- /dev/null
+++ b/src/extern-sync/README.md
@@ -0,0 +1,30 @@
+# Extern-Sync
+
+## 🎯 Purpose
+
+*Extern-Sync* is a .NET application to sync selected drilling data between a source and a target database. It consists of a couple of *sync tasks* that are executed in sequence.
+
+The application is packed into a Docker container and can be run in a containerized environment. The container exits with a non-zero exit code if any of the *sync tasks* fails.
+
+## 🛠️ Configuration
+
+The application is configured using environment variables. The following environment variables are mandatory:
+
+- `CONNECTIONSTRINGS__SourceBdmsContext`: The connection string to the source database.
+- `CONNECTIONSTRINGS__TargetBdmsContext`: The connection string to the target database.
+
+## 🧪 Unit Tests
+
+According to your needs, *sync tasks* can either be executed in a *in-memory* or a real PostgreSQL database using [Testcontainers](https://testcontainers.com/modules/postgresql/).
+
+## 🚀 Usage
+
+A full integration test can be run by executing the following commands:
+
+```bash
+# Setup environment (source and target databases)
+docker compose -f docker-compose.services.yml up --wait
+
+# Start the extern-sync container
+docker compose down && docker compose up --build
+```