Create README.md

lets-encrypt/README.md

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+A shell script to get/update Let's encrypt certs quickly. [中文](https://github.com/xdtianyu/scripts/blob/master/lets-encrypt/README-CN.md)
+------------
+
+This script uses acme_tiny.py to auth, fetch and update cert，no need for other dependency.
+
+**Download**
+
+```
+wget https://raw.githubusercontent.com/xdtianyu/scripts/master/lets-encrypt/letsencrypt.conf
+wget https://raw.githubusercontent.com/xdtianyu/scripts/master/lets-encrypt/letsencrypt.sh
+chmod +x letsencrypt.sh
+```
+
+**Configuration**
+
+Only modify DOMAIN_KEY DOMAIN_DIR DOMAINS to yours.
+
+```
+ACCOUNT_KEY="letsencrypt-account.key"
+DOMAIN_KEY="example.com.key"
+DOMAIN_DIR="/var/www/example.com"
+DOMAINS="DNS:example.com,DNS:whatever.example.com"
+```
+
+key files will be gererated automatically.
+
+**Run**
+
+```
+./letsencrypt.sh letsencrypt.conf
+```
+
+**Attention**
+
+Domain name need bind to `DOMAIN_DIR` e.g. `/var/www/example.com`，that is to say visit `http://example.com` `http://whatever.example.com` can get into `/var/www/example.com` directory，this is used to verify your domain.
+
+**cron task**
+
+Update the certs every month，you can add your command to the end of script to reload your service, e.g. `service nginx reload`
+
+```
+0 0 1 * * /etc/nginx/certs/letsencrypt.sh /etc/nginx/certs/letsencrypt.conf >> /var/log/lets-encrypt.log 2>&1
+```