add file example

examples/file/Makefile

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+run: install
+	whoami -port 8081 -name=svc1 &
+	whoami -port 8082 -name=svc2 &
+	whoami -port 8083 -name=svc3 &
+	../../dist/reproxy --file.enabled --file.name=reproxy.yml
+	pkill -9 whoami
+
+kill:
+	pkill -9 whoami
+
+install:
+	cd ../../app && CGO_ENABLED=0 go build  -o ../dist/reproxy
+	cd /tmp && go install github.com/traefik/whoami@latest

examples/file/README.md

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+# Example of a file provider
+
+To run it do `make run` and try to hit it, for example
+- `curl localhost:8080/api/svc1/aaaaa`
+- `curl localhost:8080/api/svc1`
+- `curl localhost:8080/api/svc2/something`
+- `curl localhost:8080/api/svc3/something`
+- `curl 127.0.0.1:8080/api/svc3/something`
+
+for health check try - `curl localhost:8080/health`
+
+In order to kill all services run `make kill`

examples/file/reproxy.yml

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+default:
+  - {route: "^/api/svc1/(.*)", dest: "http://127.0.0.1:8081/api/$1","ping": "http://127.0.0.1:8081/health"}
+  - {route: "/api/svc2", dest: "http://127.0.0.1:8082/api", "ping": "http://127.0.0.1:8082/health"}
+localhost:
+  - {route: "^/api/svc3/(.*)", dest: "http://localhost:8083/$1","ping": "http://127.0.0.1:8083/health"}