Add header module with spec

src/module/bm/header.rs

@@ -0,0 +1,18 @@
+use storage::file::FileHeaderSpec as FHS;
+
+pub fn get_spec() -> FHS {
+    FHS::Array {
+        allowed_types: vec![FHS::Map {
+            keys: vec![
+                FHS::Key { name: "ID",  value_type: Box::new(FHS::Text) },
+                FHS::Key { name: "URL", value_type: Box::new(FHS::Text) },
+                FHS::Key { name: "TAGS",
+                      value_type: Box::new(FHS::Array {
+                          allowed_types: vec![FHS::Text]
+                      }),
+                },
+            ],
+        }],
+    }
+}
+

src/module/bm/mod.rs

@@ -7,6 +7,8 @@ use std::result::Result;
 use clap::ArgMatches;
 use regex::Regex;
 
+mod header;
+
 pub struct BMModule {
     path: Option<String>,
 }