chore: add README

Add README as a simple document.

README.md

@@ -0,0 +1,51 @@
+# Omil
+
+Just a random name.
+
+Small pieces of tools to monitor network status using simple ICMP sniffer and send metric data points to Time Series Database.
+
+## Build
+
+```shell script
+git clone https://github.com/shallowclouds/omil.git && cd omil
+chmod +x build.sh
+./build.sh
+
+# Simple script to enable Systemd Unit
+sudo ./build/install.sh
+```
+
+## Usage
+
+Fill the `conf/config.yml` configuration file or use `--config` to specify your configuration file.
+
+```yaml
+Hostname: "home-lab"
+Targets:
+  - Host: "baidu.com"
+    Name: "baidu"
+  - Host: "google.com"
+    Name: "google"
+  - Host: "10.1.1.1"
+    Name: "gateway"
+InfluxDBv2:
+  Addr: "http://192.168.1.2:8086"
+  Org: "org-name"
+  Bucket: "bucket-name"
+  Token: "token"
+```
+
+Run the omil binary:
+
+> Sending and receiving ICMP packets needs root privilege.
+
+```shell script
+sudo /path/to/omil --config /etc/omil/config.yml
+```
+
+OR use systemd:
+```shell script
+sudo systemctl status omil.service
+sudo systemctl start omil.service
+sudo systemctl status omil.service
+```