Create README.md

README.md

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+level-sets
+==========
+
+Buckets of unique keys for level.
+
+`npm install level-sets`
+
+Usage
+=====
+
+```
+var sets = require('./')
+  , async = require('async')
+  , assert = require('assert')
+  ;
+
+var store = sets(__dirname+'/teststore', 'test')
+
+var tests =
+  [ ['key', 'test1']
+  , ['key', 'test2']
+  , ['key', 'test1']
+  , ['key2', 'test1']
+  , ['key2', 'test1']
+  , ['key2', 'test1']
+  , ['key2', 'test4']
+  ]
+
+async.each(tests, function (k, cb) {
+  store.put(k[0], k[1], cb)
+}, function (e) {
+  if (e) throw e
+  store.sum(function (e, total) {
+    if (e) throw e
+    assert.equal(total, 4)
+
+    store.sum(true, function (e, rows) {
+      if (e) throw e
+      assert.equal(rows[0].key, 'key')
+      assert.equal(rows[1].key, 'key2')
+      assert.equal(rows[0].total, 2)
+      assert.equal(rows[1].total, 2)
+
+      store.get('key', function (e, arr) {
+        assert.equal(arr.length, 2)
+
+        store.get('key2', function (e, arr) {
+          assert.equal(arr.length, 2)
+
+        })
+      })
+    })
+  })
+})
+```