Add stubs for landscape contract

contracts/equitx-landscape/src/cdp.rs

@@ -0,0 +1,9 @@
+#[subcontract]
+pub trait CDP {
+    // Deploy new xAsset contract (so it will need to store the wasm of the xAsset contract, or a reference to it by name on the Loam Registry), which is only callable by admin.
+
+    fn create_contract(&self, asset: Asset, contract: Address);
+
+    // List all CDPs for a given account, so it can iterate the "map of asset names" keys and make cross-contract calls to see if the given account has an entry in its CDPs map.
+    fn list_cdps(&self, account: Address);
+}

contracts/equitx-landscape/src/contract.rs

@@ -0,0 +1,53 @@
+use loam_sdk::{
+    soroban_sdk::{self, contracttype, env, xdr::Liabilities, Address, Bytes, Env, Lazy, Map, Vec},
+    IntoKey,
+};
+
+use crate::cdp::CDP;
+
+pub enum Asset {
+    /// Can be a Stellar Classic or Soroban asset
+    Stellar(loam_sdk::soroban_sdk::Address),
+    /// For any external tokens/assets/symbols
+    Other(loam_sdk::soroban_sdk::Symbol),
+}
+
+#[contracttype]
+#[derive(IntoKey)]
+pub struct Landscape {
+    // A map of asset names ("xUSD") to contract addresses ("C123…")
+    assets: Map<Asset, Address>,
+}
+
+impl Landscape {
+    #[must_use]
+    pub fn new(assets: Map<Asset, Address>) -> Self {
+        let mut asset_map = Map::new(env());
+        for asset in assets.into_iter() {
+            asset_map.set(asset, Map::new(env()));
+        }
+        Landscape { assets: asset_map }
+    }
+}
+
+/// Loam SDK currently requires us to implement `Default`. This will be fixed in
+/// https://github.com/loambuild/loam/issues/92
+impl Default for Landscape {
+    fn default() -> Self {
+        Landscape::new(Map::new(env()))
+    }
+}
+
+impl CDP for Landscape {
+    // Deploy new xAsset contract (so it will need to store the wasm of the xAsset contract, or a reference to it by name on the Loam Registry), which is only callable by admin.
+
+    fn create_contract(&self, asset: Asset, contract: Address) {
+        todo!()
+        //self.assets.set(asset, contract);
+    }
+
+    // List all CDPs for a given account, so it can iterate the "map of asset names" keys and make cross-contract calls to see if the given account has an entry in its CDPs map.
+    fn list_cdps(&self, account: Address) {
+        todo!()
+    }
+}

contracts/equitx-landscape/src/lib.rs

@@ -1,3 +1,7 @@
 #![no_std]
 use loam_sdk::{derive_contract, soroban_sdk::Vec};
 use loam_subcontract_core::{admin::Admin, Core};
+
+mod contract;
+
+pub use contract::Landscape;