Add install target and update README

Makefile

@@ -3,8 +3,10 @@ PDF = demo.pdf
 AUX = demo.aux
 TEXC := xelatex
 TEXC_OPTS += -shell-escape
+TEXMFHOME = $(shell kpsewhich -var-value=TEXMFHOME)
+INSTALL_DIR = $(TEXMFHOME)/tex/latex/mtheme
 
-.PHONY: clean
+.PHONY: clean install
 
 all: $(PDF)
 
@@ -17,3 +19,7 @@ $(PDF): beamerthemem.sty $(AUX) $(SRC)
 clean:
 	@rm -f $(PDF)
 	@git clean -xf
+
+install:
+	mkdir -p $(INSTALL_DIR)
+	cp *.sty $(INSTALL_DIR)

README.md

@@ -22,6 +22,9 @@ Depending on the Linux distribution, the packaged name of Fira Sans might be
 `Fira Sans OT` instead of `Fira Sans`. In that case, you may have to edit
 `beamerfontthememetropolis.sty`.
 
+To install the theme either run `make install` or copy the style files ending
+with `.sty` to the source files of your presentation.
+
 
 ### Package options