Add the root Makefile

Makefile

@@ -0,0 +1,21 @@
+.PHONY: all build clean docs fmt test 
+
+all: build test
+
+build:
+	@cd src && cargo build
+
+test: build
+	@cd src && cargo test
+
+docs:
+	@cd src && cargo doc
+	@echo "" 								# Add a blank line
+	@cd docs && mdbook build
+
+fmt:
+	@cd src && cargo fmt
+
+clean:
+	@cd src && cargo clean
+	@cd docs && mdbook clean

README.md

@@ -29,6 +29,11 @@ While there is nothing revolutionary in KxOS, it does explore some new design po
 - [ ] Iteration 5: Add a minimal set of OS-level virtualization functionalities
 - [ ] More iterations...
 
-## Technical Details
+## How to build and test
 
-TODO...
+While most code is written in Rust, the project-scope build process is governed 
+by Makefile.
+
+```bash
+make
+```