feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/js-git/doc/mixins/pack-ops.md

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+# pack-ops mixin
+
+This mixin adds the ability to consume or create packfile streams.
+
+This depends on the repo already having:
+
+ - `loadRaw(hash) => raw-binary`
+ - `saveRaw(hash, raw-binary) =>`
+
+And then adds:
+
+ - `unpack(stream, opts) => hashes`
+ - `pack(hashes, opts) => stream`
+
+The streams are simple-stream format.  This means they have a `.read(callback)`
+method for pulling items out of the stream.
+
+Example:
+
+```js
+var packOps = require('js-git/mixins/pack-ops');
+packOps(repo);
+
+repo.unpack(stream, opts, function (err, hashes) {
+  // hashes is imported objects
+});
+
+repo.pack(hashes, opts, function (err, stream) {
+  if (err) throw err;
+  stream.read(onRead);
+  function onRead(err, item) {
+    if (err) throw err;
+    console.log(item);
+    if (item) stream.read(onRead);
+  }
+});
+```