diff --git a/Cargo.lock b/Cargo.lock
index 6c2a6e14..7f94cb8b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -145,12 +145,6 @@ version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e496a50fda8aacccc86d7529e2c1e0892dbd0f898a6b5645b5561b89c3210efa"
 
-[[package]]
-name = "dotenvy"
-version = "0.15.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
-
 [[package]]
 name = "encoding_rs"
 version = "0.8.32"
@@ -222,7 +216,6 @@ name = "fhir-sdk"
 version = "0.4.0"
 dependencies = [
  "async-trait",
- "dotenvy",
  "eyre",
  "fhir-model 0.4.0",
  "futures",
diff --git a/README.md b/README.md
index 50380b04..880c39bf 100644
--- a/README.md
+++ b/README.md
@@ -13,21 +13,20 @@ This is a [FHIR](https://www.hl7.org/fhir/) library in its early stages. The mod
 
 ## Features
 
-- [x] Generation of FHIR codes, types and resources
+- [x] Generated FHIR codes, types and resources
 - [x] Serialization and deserialization to and from JSON
-- [x] Linked code-fields to respective enums
-- [x] Builders for types and resources
-- [x] Allow to convert code enums to Coding and CodeableConcept
+- [x] Optional builders for types and resources
 - [x] Implementation of base traits
-  - [x] (Base)Resource
-  - [x] NamedResource
-  - [x] DomainResource
-  - [x] IdentifiableResource
+  - [x] (Base)Resource for accessing common fields
+  - [x] NamedResource for getting the resource type in const time
+  - [x] DomainResource for accessing common fields
+  - [x] IdentifiableResource for all resources with an identifier field
 - [x] REST client implementation
   - [x] Create, Read, Update, Delete
   - [x] Search
   - [x] Paging
   - [ ] Batch operations / Transactions
+  - [ ] Operations
   - [ ] Patch
 - [ ] FHIRpath implementation
 - [ ] Resource validation using FHIRpath and regular expressions
@@ -37,6 +36,32 @@ This is a [FHIR](https://www.hl7.org/fhir/) library in its early stages. The mod
 
 - XML
 
+## Example
+
+```rust
+use fhir_sdk::r5::resources::Patient;
+use fhir_sdk::client::*;
+
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    // Set up the client using the local test server.
+    let client = Client::new("http://localhost:8090/fhir/".parse().unwrap())?;
+
+    // Create a Patient resource using a typed builder.
+    let mut patient = Patient::builder().active(false).build();
+    // Push it to the server.
+    patient.create(&client).await?;
+    // The id and versionId is updated automatically this way.
+    assert!(patient.id.is_some());
+
+    Ok(())
+}
+```
+
+## Testing
+
+Simply set up the FHIR test server using `docker compose up -d` and run `cargo test --workspace` in the workspace root.
+
 ## Known Problems
 
 - Due to the big number of big types, the compile time and its memory usage is really high. The auto-generated builders also take a long time during the build time.
diff --git a/crates/fhir-sdk/Cargo.toml b/crates/fhir-sdk/Cargo.toml
index f9ba8130..68321780 100644
--- a/crates/fhir-sdk/Cargo.toml
+++ b/crates/fhir-sdk/Cargo.toml
@@ -29,6 +29,5 @@ thiserror = {version = "1.0.40", optional = true}
 tokio-retry = {version = "0.3.0", optional = true}
 
 [dev-dependencies]
-dotenvy = "0.15.7"
 eyre = "0.6.8"
 tokio = {version = "1.27.0", features = ["full"]}
diff --git a/crates/fhir-sdk/tests/client.rs b/crates/fhir-sdk/tests/client.rs
index 28d634b9..342d61e0 100644
--- a/crates/fhir-sdk/tests/client.rs
+++ b/crates/fhir-sdk/tests/client.rs
@@ -12,8 +12,8 @@ use fhir_sdk::{
 use futures::TryStreamExt;
 
 fn client() -> Result<Client> {
-	dotenvy::dotenv()?;
-	let base_url = env::var("BASE_URL").expect("BASE_URL missing").parse()?;
+	let base_url =
+		env::var("FHIR_SERVER").unwrap_or("http://localhost:8090/fhir/".to_owned()).parse()?;
 	Ok(Client::new(base_url)?)
 }
 
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 00000000..6e2050c0
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,18 @@
+version: '3.7'
+
+services:
+  fhir:
+    image: hapiproject/hapi:latest
+    ports:
+      - "8090:8080"
+    volumes:
+      - fhir-data:/data/hapi
+    environment:
+      hapi.fhir.fhir_version: "R5"
+      hapi.fhir.tester.home.fhir_version: "R5"
+      hapi.fhir.subscription.resthook_enabled: "true"
+      hapi.fhir.subscription.email.from: "test@test.test"
+      hapi.fhir.subscription.email.host: "test.test"
+
+volumes:
+  fhir-data: