Add stewardship readiness asset: .gitattributes

.gitattributes

@@ -0,0 +1,27 @@
+<!-- stewardship-standard: gitattributes-v1 -->
+* text=auto eol=lf
+
+*.md text eol=lf
+*.txt text eol=lf
+*.json text eol=lf
+*.yml text eol=lf
+*.yaml text eol=lf
+*.sh text eol=lf
+*.py text eol=lf
+*.js text eol=lf
+*.ts text eol=lf
+*.c text eol=lf
+*.cpp text eol=lf
+*.h text eol=lf
+*.hpp text eol=lf
+
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.webp binary
+*.pdf binary
+*.zip binary
+*.bin binary
+*.elf binary
+*.uf2 binary