11-readme-clean-up

* Added instructions to build sigfn in README
* Added instructiosnt to run unit tests in README

README.md

@@ -10,6 +10,22 @@ Bind callback functions to OS signals in C and C++.
 SigFn should work in any system with the standard C library,
 which provides the `<signal.h>` header.
 
+## Building Unit Tests
+```bash
+cd <sigfn_root_dir>
+mkdir build && cd build
+cmake .. -DSIGFN_TESTS=ON
+make
+```
+
+## Running Unit Tests
+```bash
+cd <signfn_root_dir>/build/tests
+./unit <unit-test-name>
+# e.g.
+./unit sigfn_handle
+```
+
 ## Usage
 
 SigFn usage is similar to the `os/signal` package from Golang.
@@ -113,4 +129,4 @@ int main(int argc, const char **argv)
     }
     return 0;
 }
-```
+```