Add Ledger (sindresorhus#984)

Author: sfischer13

readme.md

@@ -550,6 +550,7 @@
 - [Esolangs](https://github.com/angrykoala/awesome-esolangs) - Programming languages designed for experimentation or as jokes rather than actual use.
 - [Prometheus](https://github.com/roaldnefs/awesome-prometheus) - Open-source monitoring system.
 - [Homematic](https://github.com/hobbyquaker/awesome-homematic) - Smart home devices.
+- [Ledger](https://github.com/sfischer13/awesome-ledger) - Double-entry accounting on the command-line.
 
 
 ## License