add varnish

.gitignore

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+*.swp

varnish/cli.md

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+### Get Backend list and their status
+
+```bash
+varnishadm backend.list
+```
+
+### Get value of a config parameter
+
+```bash
+varnishadm param.show http_resp_hdr_len
+```
+
+### Set value of a config parameter
+
+```bash
+varnishadm param.set http_resp_hdr_len 16384
+```
+
+### Ban URL
+
+```bash
+varnishadm ban req.http.host == example.com '&&' req.url '~' '/test/'
+```
+
+### Get request detail filtered by ReqURL
+
+```bash
+varnishlog -q 'ReqURL eq "/test/"' -g request
+```