doc: add spark doc

docs/zh/spark.md

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+## Spark
+
+### 开启
+
+打开 `droplet` 配置文件 `config.toml`，在 `[CommonProvider]` 下面增加下面的配置，`PublicHostname` 是公网 IP 地址。
+
+```
+  [CommonProvider.IndexProvider]
+    Enable = true
+    EntriesCacheCapacity = 1024
+    EntriesChunkSize = 16384
+    TopicName = ""
+    PurgeCacheOnStart = false
+    WebHost = "cid.contact"
+    DataTransferPublisher = true
+    [CommonProvider.IndexProvider.Announce]
+      AnnounceOverHttp = true
+      DirectAnnounceURLs = ["https://cid.contact/ingest/announce"]
+    [CommonProvider.IndexProvider.HttpPublisher]
+      Enabled = true
+      PublicHostname = "127.0.0.1"
+      Port = 41263
+      WithLibp2p = false
+```
+
+### 命令行命令
+
+1. 发布单个矿工所有的订单到 ipni
+
+```bash
+./droplet index announce-all --miner t01001
+```
+
+2. 发布单个订单到 ipni
+
+```bash
+./droplet index announce-deal <deal uuid> 
+or
+./droplet index announce-deal <proposal cid>
+```
+
+3. 从 ipni 移除订单
+
+```bash
+./droplet index announce-remove-deal <deal uuid> 
+or
+./droplet index announce-remove-deal <proposal cid>
+```
+
+### 检查
+
+通过 https://cid.contact/ 输入订单的 `piece cid`，查看订单是否已经发布到 ipni。
+
+### 注意
+
+`droplet` 版本要不低于 `v2.12.0`，`venus` 版本要不低于 `v1.16.0`。