feat: add Pessoa struct and file processing for RPPSS records

- Implemented Pessoa struct with fields for CPF, name, and value.
- Added functionality to read and parse a specific file format, skipping the first four lines.
- Converted parsed records into JSON format and saved to output.json.
- Included example search functionality for a specific CPF.

Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "dmed"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"