Add shadowtls (#49)

* Add shadowtls outbound

* Add shadowtls inbound

* Add shadowtls example

* Add shadowtls documentation

docs/configuration/inbound/shadowtls.md

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+### Structure
+
+```json
+{
+  "type": "shadowtls",
+  "tag": "st-in",
+
+  ... // Listen Fields
+
+  "handshake": {
+    "server": "google.com",
+    "server_port": 443,
+    
+    ... // Dial Fields
+  }
+}
+```
+
+### Listen Fields
+
+See [Listen Fields](/configuration/shared/listen) for details.
+
+
+### Fields
+
+#### handshake
+
+==Required==
+
+Handshake server address and [dial options](/configuration/shared/dial).
+

docs/configuration/inbound/shadowtls.zh.md

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+### 结构
+
+```json
+{
+  "type": "shadowtls",
+  "tag": "st-in",
+
+  ... // 监听字段
+
+  "handshake": {
+    "server": "google.com",
+    "server_port": 443,
+
+    ... // 拨号字段
+  }
+}
+```
+
+### 监听字段
+
+参阅 [监听字段](/zh/configuration/shared/listen/)。
+
+### 字段
+
+#### handshake
+
+==必填==
+
+握手服务器地址和 [拨号参数](/zh/configuration/shared/dial/)。