add Makefile, update README

Makefile

@@ -0,0 +1,14 @@
+PREFIX ?= /usr/local
+BINDIR ?= $(PREFIX)/bin
+MODE = 755
+SCRIPT = rlmariabackup
+
+.PHONY: all install
+
+all:
+	@echo "Run 'make install' to install rlmariabackup"
+
+install:
+	install -d $(BINDIR)
+	install -m $(MODE) $(SCRIPT) $(BINDIR)/
+	@echo "rlmariabackup has been installed to $(BINDIR)"

README.md

@@ -1,5 +1,25 @@
 # rlmariabackup
 
-# License
+A shell script utility for managing MariaDB backups.
 
-BSD-2-Clause
+## Installation
+
+You can install rlmariabackup using the provided Makefile:
+
+```
+make install
+```
+
+This will install the script to `/usr/local/bin`. If you want to install to a different location, you can specify the PREFIX:
+
+```
+make install PREFIX=/opt
+```
+
+## Usage
+
+Run `rlmariabackup help` to see available commands and options.
+
+## License
+
+BSD-2-Clause