Add concat example

examples/concat/Makefile

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+.PHONY: build
+build:
+	mkdir -p output
+	protoc -I. --gotemplate_out=template_dir=templates,debug=true,all=true:output proto/*.proto
+
+
+.PHONY: re
+re: clean build
+
+
+.PHONY: clean
+clean:
+	rm -rf output

examples/concat/output/concat.txt

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+I'm Eric
+I'm Francis
+I'm Arnold

examples/concat/output/static.txt

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+This is static text.This is static text.This is static text.

examples/concat/proto/Eric.proto

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+syntax = "proto3";
+package Eric;

examples/concat/proto/Francis.proto

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+syntax = "proto3";
+package Francis;

examples/concat/proto/arnold.proto

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+syntax = "proto3";
+package Arnold;

examples/concat/templates/concat.txt.tmpl

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+I'm {{.File.Package}}

examples/concat/templates/static.txt.tmpl

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+This is static text.