Created How to use debug api (markdown)

How-to-use-debug-api.md

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+### Get this repo
+```
+git clone -b alpha https://github.com/MetaCubeX/Clash.Meta.git clash-meta
+cd clash-meta
+```
+
+### Apply patch
+```
+git apply patch/*.patch  
+```
+
+### Build clash-meta
+```
+go build -o clash-meta
+```
+
+### start clash-meta:
+put your config.yaml in this directory and run:
+```
+./clash-meta -d ./
+```
+
+### Use debug API
+You can check available API on `http://127.0.0.1:xxxx/debug/pprof/`,
+`xxxx` refers to the `external-controller` port in your config.yaml.
+
+You may need to install [Graphviz](https://graphviz.org/download/) before you view the http debug API tools below:
+
+Heap details: 
+```
+go tool pprof -http=:8080 http://127.0.0.1:xxxx/debug/pprof/heap
+````
+Allocs details
+````
+go tool pprof -http=:8080 http://127.0.0.1:xxxx/debug/pprof/allocs
+````