diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f6397ec
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[workspace]
+members = [
+    "app",
+    "lib",
+]
+resolver = "3"
+
+[workspace.package]
+edition = "2024"
+authors = ["chodak166 <chodak166@op.pl>"]
+license = "MIT"
\ No newline at end of file
diff --git a/app/Cargo.toml b/app/Cargo.toml
new file mode 100644
index 0000000..f6a49b8
--- /dev/null
+++ b/app/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "mnemo-r"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+clap = { version = "4.5.51", features = ["derive"] }
+libmnemor = { path = "../lib" }
+
+[profile.release]
+lto = true              # Link Time Optimization: Analyzes entire program for optimizations
+codegen-units = 1       # Forces single-threaded compilation (slower build, but smaller/faster binary)
diff --git a/app/src/main.rs b/app/src/main.rs
new file mode 100644
index 0000000..af5d737
--- /dev/null
+++ b/app/src/main.rs
@@ -0,0 +1,81 @@
+use clap::{Parser, ValueEnum};
+
+#[derive(ValueEnum, Debug, Clone)]
+enum System {
+    #[value(name = "major-en")]
+    MajorEn,
+    #[value(name = "major-pl")]
+    MajorPl,
+}
+
+trait SystemEncoder {
+    fn encode(&self, word: &str) -> String;
+}
+
+struct MajorEncoder {
+    dict: String, // TODO
+}
+
+impl SystemEncoder for MajorEncoder {
+    fn encode(&self, word: &str) -> String {
+        let num_word: String = word
+            .chars()
+            .map(|c| c.to_digit(10).unwrap_or(0).to_string())
+            .collect();
+        format!("{}_{} -> {}", word, self.dict, num_word)
+    }
+}
+
+fn create_encoder(system: &System) -> Box<dyn SystemEncoder> {
+    match system {
+        System::MajorPl => Box::new(MajorEncoder {
+            dict: String::from("dict-major-pl"),
+        }),
+        System::MajorEn => Box::new(MajorEncoder {
+            dict: String::from("dict-major-en"),
+        }),
+    }
+}
+
+#[derive(Parser)]
+#[command(author, version, about)]
+struct CliArgs {
+    /// System name
+    #[arg(short, long, default_value = "major-pl")]
+    system: System,
+
+    /// Encode given word
+    #[arg(short, long)]
+    encode: Option<String>,
+
+    /// List supported systems
+    #[arg(long)]
+    list_systems: bool,
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args = CliArgs::parse();
+
+    if args.list_systems {
+        println!("Supported systems:");
+        for system in System::value_variants() {
+            if let Some(possible_value) = system.to_possible_value() {
+                println!("-  {}", possible_value.get_name());
+            }
+        }
+        return Ok(());
+    }
+
+    if let Some(word) = args.encode {
+        println!(
+            "Encoding {} with system {:?}...",
+            word,
+            args.system.to_possible_value().unwrap().get_name()
+        );
+        let encoder = create_encoder(&args.system);
+        let encoded_word = encoder.encode(&word);
+        println!("Encoded: [{}]", encoded_word);
+    }
+
+    Ok(())
+}
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
new file mode 100644
index 0000000..79650cf
--- /dev/null
+++ b/lib/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "libmnemor"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/lib/src/core/major_system_encoder.rs b/lib/src/core/major_system_encoder.rs
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/core/traits/system_encoder.rs b/lib/src/core/traits/system_encoder.rs
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
new file mode 100644
index 0000000..d06c3d7
--- /dev/null
+++ b/lib/src/lib.rs
@@ -0,0 +1,28 @@
+pub struct TextProcessor {
+    prefix: String,
+}
+
+impl TextProcessor {
+    /// Create a new processor with custom prefix
+    pub fn new(prefix: &str) -> Self {
+        Self {
+            prefix: prefix.to_string(),
+        }
+    }
+
+    /// Process input text by adding prefix and converting to uppercase
+    pub fn process(&self, input: &str) -> String {
+        format!("{} {}", self.prefix, input.to_uppercase())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_processing() {
+        let processor = TextProcessor::new(">> ");
+        assert_eq!(processor.process("hello"), ">> HELLO");
+    }
+}