Add a readme.

Author: Erick Tryzelaar

README.md

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+This is a suite of serialization benchmarks. In comprises of the following projects:
+
+* C++
+ * [rapidjson](https://github.com/erickt/rapidjson)
+* Go
+ * [encoding/json](http://golang.org/pkg/encoding/json)
+ * [ffjson](https://github.com/pquerna/ffjson)
+ * [go-capnproto](https://github.com/glycerine/go-capnproto)
+ * [gogoprotobuf](http://code.google.com/p/gogoprotobuf/)
+ * [goprotobuf](http://code.google.com/p/goprotobuf/)
+* Rust
+ * [bincode](https://github.com/TyOverby/bincode)
+ * [capnproto-rust](https://github.com/dwrensha/capnproto-rust)
+ * [rust-msgpack](https://github.com/mneumann/rust-msgpack)
+ * [rust-protobuf](https://github.com/stepancheg/rust-protobuf)
+ * [rust-serde](https://github.com/erickt/rust-serde)
+ * [serialize](http://doc.rust-lang.org/serialize/)
+
+The initial benchmark suite is derived from
+[Goser](https://github.com/cloudflare/goser) benchmark, which is all about
+serializing and serializing from this JSON record:
+
+```json
+{
+    "timestamp": 25469139677502,
+    "zone_id": 123456,
+    "zone_plan": 1,
+    "http": {
+        "protocol": 2,
+        "status": 200,
+        "host_status": 503,
+        "up_status": 520,
+        "method": 1,
+        "content_type": "text/html",
+        "user_agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/33.0.1750.146 Safari/537.36",
+        "referer": "https: //www.cloudflare.com/",
+        "request_uri": "/cdn-cgi/trace"
+    },
+    "origin": {
+        "ip": "1.2.3.4",
+        "port": 8000,
+        "hostname": "www.example.com",
+        "protocol": 2
+    },
+    "country": 238,
+    "cache_status": 3,
+    "server_ip": "192.168.1.1",
+    "server_name": "metal.cloudflare.com",
+    "remote_ip": "10.1.2.3",
+    "bytes_dlv": 123456,
+    "ray_id": "10c73629cce30078-LAX"
+}
+```
+
+To run the tests, do:
+
+```
+% git submodule init
+% git submodule sync
+% make
+```