added usage info and thanks

README.md

@@ -6,3 +6,23 @@ by George Marsaglia, Arif Zaman, Wai Wan Tsang
 published in Statistics & Probability Letters Volume 9, Issue 1, January 1990, Pages 35-39
 https://www.sciencedirect.com/science/article/abs/pii/016771529090092L?via%3Dihub
 
+# Building
+
+```bash
+git clone https://git.redacted.cc/rich/ReUnirand.git
+cd ReUnirand
+mkdir build; cd build; cmake ..; make
+./ReUnirand-Test
+```
+
+# Using
+
+```c
+rng.rinit(170); // seed value must be in range 0 to 900000000
+float randomNumber = rng.uni();
+```
+
+# Thanks
+
+Written by Rich, hosted on the Redacted gitea with thanks to Maxine, Bill and Josh.
+