Add metadata files

.editorconfig

@@ -0,0 +1,13 @@
+; This file is for unifying the coding style for different editors and IDEs.
+; More information at http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.yml]
+indent_size = 2

.gitattributes

@@ -0,0 +1,24 @@
+# Define the line ending behavior of the different file extensions
+# Set default behavior, in case users don't have core.autocrlf set.
+* text=auto eol=lf
+
+# Explicitly declare text files we want to always be normalized and converted
+# to native line endings on checkout.
+*.php text
+*.yml text
+
+# Remove files for archives generated using `git archive`
+.github export-ignore
+tests export-ignore
+.coveralls export-ignore
+.editorconfig export-ignore
+.gitattributes export-ignore
+.gitignore export-ignore
+.stickler.yml export-ignore
+.travis.yml export-ignore
+phpcs.xml.dist export-ignore
+phpstan.neon export-ignore
+phpstan-baseline.neon export-ignore
+phpunit.xml.dist export-ignore
+psalm.xml export-ignore
+psalm-baseline.xml export-ignore