Add short usage instructions to README file

Author: glopesdev

README.md

@@ -12,3 +12,31 @@ datamodel-codegen --input ./reflex-generator/schema/device.json --output harp/mo
 
 > [!IMPORTANT]
 > Currently code generation adds an unwanted field at the very end of the data model definition `registers: Optional[Any] = None`. This declaration needs to be removed for serialization to work properly.
+
+## How to use
+
+### Read Harp device schema from YML file
+
+```python
+from harp.schema import read_schema
+schema = read_schema('device.yml')
+```
+
+### Create device reader object from schema
+
+```python
+from harp.reader import create_reader
+reader = create_reader(schema)
+```
+
+### Read data from named register
+
+```python
+reader.OperationControl.read("data/Behavior_10.bin")
+```
+
+### Access register metadata
+
+```python
+reader.OperationControl.register.address
+```