New: initial functionality

src/error.rs

@@ -0,0 +1,19 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("failed to open the ZIP-archive")]
+    OpenArchiveFailed(#[source] zip::result::ZipError),
+
+    #[error("failed to open the battle results entry in the replay archive")]
+    OpenBattleResultsFailed(#[source] zip::result::ZipError),
+
+    #[error("failed to read the archive entry")]
+    ReadEntryFailed(#[source] std::io::Error),
+
+    #[error("failed to decode")]
+    DecodeFailed(#[source] prost::DecodeError),
+
+    #[error("failed to un-pickle")]
+    UnpickleFailed(#[source] serde_pickle::Error),
+}