add docs for vote (#155)

diff --git a/docs/vote/read.md b/docs/vote/read.md
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+json中的actions是一个数组，每个数组中都有一个type类型，account_id是钱包中账户的id
+
+# vote
+
+Example
+
+```shell
+curl -X POST http://ip:port/build-transaction -d '{"base_transaction":null,"actions":[{"account_id":"0BF63M2U00A04","amount":20000000,"asset_id":"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff","type":"spend_account"},{"account_id":"0BF63M2U00A04","amount":99,"asset_id":"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff","type":"spend_account"},{"amount":99,"asset_id":"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff","address":"sm1qt3rl8gxa8c0fj4h7tv8cjurja5elnmaeu5e2su","vote":"af594006a40837d9f028daabb6d589df0b9138daefad5683e5233c2646279217294a8d532e60863bcf196625a35fb8ceeffa3c09610eb92dcfb655a947f13269","type":"vote_output"}],"ttl":0,"time_range": 43432}'
+```
+
+以上实例中：
+
+第一个action的type:spend_account 是手续费
+第二个action的type:spend_account 是要投多少票
+第三个action的type:vote_output是投票的输出
+1、vote_output的amout 与 第二个spend_account的amount相同
+2、address指的是锁定到哪个地址
+    地址自己的：投票
+    地址别人的：转账+投票
+3、vote
+    被投票的公钥
+
+
+
+# cancel vote
+
+Example
+
+```shell
+curl -X POST http://ip:port/build-transaction -d '{"base_transaction":null,"actions":[{"account_id":"0BF63M2U00A04","amount":20000000,"asset_id":"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff","type":"spend_account"},{"account_id":"0BF63M2U00A04","amount":99,"asset_id":"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff","vote":"af594006a40837d9f028daabb6d589df0b9138daefad5683e5233c2646279217294a8d532e60863bcf196625a35fb8ceeffa3c09610eb92dcfb655a947f13269","type":"unvote"},{"amount":99,"asset_id":"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff","address":"bm1q50u3z8empm5ke0g3ngl2t3sqtr6sd7cepd3z68","type":"control_address"}],"ttl":0,"time_range": 43432}'
+```
+
+以上实例中：
+
+第一个action的type:spend_account 是手续费
+第二个action的type:unvote  取消投票，vote 被取消投票的公钥
+第三个action的type:control_address 还是以前的输出
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