feat(shared domain): start working on shared domain

src/contexts/mod.rs

@@ -0,0 +1 @@
+pub mod shared;

src/contexts/shared/domain/mod.rs

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+use std::path::PathBuf;
+
+pub struct SQLWriter {
+    database: PathBuf,
+}
+
+pub trait Writable {
+    fn write() -> Result<String, diesel::result::Error>;
+}
+
+pub trait Readable {
+    fn read() -> Result<Box<Self>, diesel::result::Error>;
+}

src/contexts/shared/mod.rs

@@ -0,0 +1 @@
+pub mod domain;