Add usage instructions to usage.md

Author: gwillem

docs/usage.md

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+
+# Scan your store in 5 minutes
+
+eComscan is the mwscan successor and we recommend everyone to upgrade. Scan your system in 5 minutes. Run this command in a SSH terminal:
+
+```
+curl https://ecomscan.com | sh
+```
+
+Read more about [eComscan](https://sansec.io/?mwscan). It is developed by [Sansec](https://sansec.io/?mwscan), experts in Magento store security and Adobe Commerce security partner. 
+
+### eComscan features
+
+- 50 thousand malware signatures and counting
+- Detects vulnerabilities in popular ecommerce platforms (Magento, Woocommerce, Prestashop etc) and third party ecommerce components
+- Monitoring of files, databases, processes, cron... 
+- Get instant, actionable alerts via mail, Slack or API webhook
+
+The Sansec threat intel team [investigates](https://sansec.io/research?mwscan) hundreds of hacked stores per month, and adds new attack signatures multiple times per day. eComscan is the best solution to protect your Magento store from emerging threats. 
+
+### Sample command line scan 
+![Sample CLI scan output](https://sansec.io/assets/posts/screens/screenshotb.png)
+
+### Sample report
+![Sample GUI scan output](https://sansec.io/assets/posts/screens/screenshot_mail.png)
+
+# Who uses it?
+
+Mwscan and its successor eComscan are used by Adobe, the [US Department of Homeland Security](https://www.dhs.gov/topic/cybersecurity), the [Magento Marketplace](https://twitter.com/jason_c_cochran/status/850043415194685441), [Magereport](https://www.magereport.com) and many of the [global top ecommerce agencies](https://sansec.io/partners).
+
+# About payment skimming and Magecart
+
+Online payment skimming (aka [MageCart](https://sansec.io/what-is-magecart)) is a growing threat to digital stores. Since our first publication in [2015](https://sansec.io/research/widespread-credit-card-hijacking-discovered/), we identified more than [90.000 compromised stores](https://twitter.com/gwillem/status/1050480393743491074). In most cases, malware is inserted that will a) intercept customer data, b) divert payments or c) uses your customers for cryptojacking.
+
+Privacy watchdogs and online regulators are increasingly handing out fines to companies who suffered a Magecart attack. 
+