add delete dict operations

src-core/examples/remove_one_yomitan_dict.rs

@@ -0,0 +1,18 @@
+use std::time::Instant;
+
+use anyhow::Ok;
+use cjdic2_core::AppService;
+
+mod common;
+use common::get_db_dir;
+
+fn main() -> Result<(), anyhow::Error> {
+    let service = AppService::new(get_db_dir())?;
+
+    let start = Instant::now();
+    let mut writer = service.get_yomitan_writer()?;
+    AppService::remove_yomitan_dictionary(&mut writer, "JMnedict")?;
+    println!("[{:.2?}]", start.elapsed());
+
+    Ok(())
+}