Add template for the compact ecash crate

common/nym-compact-ecash/Cargo.toml

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+[package]
+name = "nym-compact-ecash"
+version = "0.1.0"
+authors = ["Ania Piotrowska <ania@nymtech.net>"]
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bls12_381 = { version = "0.5", default-features = false, features = ["pairings", "alloc", "experimental"] }
+
+[dev-dependencies]
+criterion = { version = "0.3", features = ["html_reports"] }

common/nym-compact-ecash/src/lib.rs

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+mod proofs;
+mod scheme;

common/nym-compact-ecash/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

common/nym-compact-ecash/src/scheme/mod.rs

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+pub mod aggregation;
+pub mod withdrawal;
+pub mod keygen;
+pub mod setup;
+pub mod spend;

common/nym-compact-ecash/src/scheme/setup.rs

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+use bls12_381::{G1Affine, G2Affine};
+
+pub struct Parameters {
+    /// Generator of the G1 group
+    g1: G1Affine,
+    /// Generator of the G2 group
+    g2: G2Affine,
+    /// Additional generators of the G1 group
+    gammas: Vec<G1Affine>,
+    /// Value of wallet
+    L: usize,
+}