Add git config files

Author: alcaeus

.gitattributes

@@ -0,0 +1,13 @@
+.* export-ignore
+*.md export-ignore
+tests export-ignore
+docs export-ignore
+examples export-ignore
+mongo-orchestration export-ignore
+stubs export-ignore
+tools export-ignore
+phpcs.xml.dist export-ignore
+phpunit.evergreen.xml export-ignore
+phpunit.xml.dist export-ignore
+psalm.xml.dist export-ignore
+psalm-baseline.xml export-ignore

.gitignore

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+# Composer
+composer.phar
+composer.lock
+vendor/
+
+# PHPUnit
+phpunit.phar
+phpunit.xml
+.phpunit.result.cache
+
+# phpcs
+.phpcs-cache
+phpcs.xml
+
+# psalm
+psalm.xml
+
+# phpbench
+.phpbench/
+phpbench.json
+