chore: reorg

__database/sled/Cargo.lock

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+# It is not intended for manual editing.
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__database/sled/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "sled"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sled = "0.31.0"
+

__database/sled/src/main.rs

@@ -0,0 +1,19 @@
+// http://sled.rs/
+fn main() -> Result<(), Box<dyn std::error::Error>>{
+    let path = "a.file";
+    let tree = sled::open(path)?;
+
+    let k = "hello";
+    let v = "world";
+
+    // insert and get, similar to std's BTreeMap
+    tree.insert(k, v)?;
+
+    for kv in tree.range(k..) {
+        println!("kv: {:?}", kv);
+    }
+
+    tree.flush()?;
+
+    Ok(())
+}