Added a makefile

Makefile

@@ -0,0 +1,21 @@
+OPTIONS = markdown+yaml_metadata_block+smart
+
+NOTES_DIR = prelim_notes
+PDF_DIR = pdf
+NOTES = $(wildcard $(NOTES_DIR)/*.md)
+PDFS = $(patsubst %.md,%.pdf,$(subst $(NOTES_DIR),$(PDF_DIR),$(NOTES)))
+
+all: $(PDFS)
+
+$(PDF_DIR)/%.pdf: $(NOTES_DIR)/%.md pdf_dir 
+	pandoc \
+		--variable mainfont="Roboto" \
+		--variable monofont="Fira Code" \
+		--variable fontsize=11pt \
+		--variable geometry:"top=1in, bottom=1in, left=1in, right=1in" \
+		--variable geometry:letterpaper \
+		-f markdown  $< \
+		-o $@
+
+pdf_dir:
+	mkdir -p $(PDF_DIR)