Add .gitignore, .dockerignore, .editorconfig (refs #1)

.dockerignore

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+.git/
+bin/
+*.md
+LICENSE
+.editorconfig
+.gitignore

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab

.gitignore

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+bin/
+vendor/
+data/
+.env
+*.exe
+/bsdaily