* Added basic Wallet API stubs

src/api/mod.rs

@@ -1,2 +1,3 @@
 pub mod anoncreds;
-pub mod sovrin;
+pub mod sovrin;
+pub mod wallet;

src/api/wallet.rs

@@ -0,0 +1,73 @@
+use commands::{Command, CommandExecutor};
+use errors::wallet::WalletError;
+
+use std::sync::Arc;
+
+pub struct WalletAPI {
+    command_executor: Arc<CommandExecutor>,
+}
+
+impl WalletAPI {
+    /// Constructs a new `WalletAPI`.
+    ///
+    /// #Params
+    /// command_executor: Reference to `CommandExecutor` instance.
+    ///
+    pub fn new(command_executor: Arc<CommandExecutor>) -> WalletAPI {
+        WalletAPI { command_executor: command_executor }
+    }
+
+    /// Set or update Wallet record identified by keys list.
+    ///
+    /// #Params
+    /// keys: List of keys that identify Wallet record.
+    /// value: Wallet record value to set or update.
+    /// cb: Callback that takes command result as parameter.
+    ///
+    /// #Returns
+    /// No result
+    ///
+    /// #Errors
+    /// No method specific errors.
+    /// See `WallerError` docs for common errors description.
+    pub fn set(keys: &[&str], value: &str, cb: Box<Fn(Result<(), WalletError>) + Send>) {
+        unimplemented!();
+    }
+
+    /// Get Wallet record identified by keys list.
+    ///
+    /// #Params
+    /// keys: List of keys that identify Wallet record.
+    /// cb: Callback that takes command result as parameter.
+    ///
+    /// #Returns
+    /// Value of corresponded Wallet record.
+    ///
+    /// #Errors
+    /// WalletError::NotFound - If no corresponded Wallet record found.
+    /// See `WallerError` docs for common errors description.
+    pub fn get(keys: &[&str], cb: Box<Fn(Result<String, WalletError>) + Send>) {
+        unimplemented!();
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn wallet_api_can_be_created() {
+        let sovrin_api = WalletAPI::new(Arc::new(CommandExecutor::new()));
+        assert! (true, "No crashes on WalletAPI::new");
+    }
+
+    #[test]
+    fn wallet_api_can_be_dropped() {
+        fn drop_test() {
+            let sovrin_api = WalletAPI::new(Arc::new(CommandExecutor::new()));
+        }
+
+        drop_test();
+        assert! (true, "No crashes on WalletAPI::drop");
+    }
+}