Add plugins (#27)

plugins/wasm-go/README.md

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+## Intro
+
+This SDK is used to develop the WASM Plugins of MSE Gateway (powered by envoy).
+
+## Requirements
+
+(need support Go's type parameters)
+
+Go version: >= 1.18
+
+TinyGo version: >= 0.25.0
+
+## Quick Examples
+
+### wasm plugin config
+
+```yaml
+# this config will take effect globally (all incoming requests are affected)
+block_urls:
+- "test"
+_rules_:
+# matching by route name takes effect
+- _match_route_:
+  - route-a
+  - route-b
+  block_bodys:
+  - "hello world"
+# matching by domain takes effect
+- _match_domain_:
+  - "*.example.com"
+  - test.com
+  block_urls:
+  - "swagger.html"
+  block_bodys:
+  - "hello world"
+```
+
+### code
+
+[request-block](example/request-block)
+
+
+### compile to wasm
+
+```bash
+tinygo build -o main.wasm -scheduler=none -target=wasi ./main.go
+```
+
+