ci: Configure installation of dev version

Makefile

@@ -27,6 +27,11 @@ test:
 	@echo '# Unit tests: $(TEST)' >&2
 	@$(TEST)
 
+install:
+	@echo '# Install in /usr/local/bin' >&2
+	@mkdir -p /usr/local/bin
+	@cp unittest /usr/local/bin/
+
 dist: unittest
 	@echo '# Create release artifacts in ./dist' >&2
 	@mkdir -p ./dist

README.md

@@ -87,13 +87,22 @@ For example, tests see files inside the [tests directory](./tests).
     mv unittest /usr/local/bin/
     ```
 
+### Development version
+
+```bash
+git clone [email protected]:macie/unittest.sh.git
+cd unittest.sh
+make && make install
+```
+
 ## Development
 
 Use `make` (GNU or BSD):
 
 - `make` - run checks
 - `make test` - run test
 - `make check` - perform static code analysis
+- `make install` - install in `/usr/local/bin`
 - `make dist` - prepare for distributing
 - `make clean` - remove distributed artifacts
 - `make release` - tag latest commit as a new release