add missing files

samples/react-avatar/.editorconfig

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+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+
+[*]
+
+# change these settings to your own preference
+indent_style = space
+indent_size = 2
+
+# we recommend you to keep these unchanged
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{package,bower}.json]
+indent_style = space
+indent_size = 2

samples/react-avatar/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Dependency directories
+node_modules
+
+# Build generated files
+dist
+lib
+solution
+temp
+*.sppkg
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# OSX
+.DS_Store
+
+# Visual Studio files
+.ntvs_analysis.dat
+.vs
+bin
+obj
+
+# Resx Generated Code
+*.resx.ts
+
+# Styles Generated Code
+*.scss.ts

samples/react-avatar/.yo-rc.json

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+{
+  "@microsoft/generator-sharepoint": {
+    "isCreatingSolution": true,
+    "environment": "spo",
+    "version": "1.11.0",
+    "libraryName": "react-avatar",
+    "libraryId": "b96dfed7-ec48-4082-ba50-f6c7b09143c7",
+    "packageManager": "npm",
+    "isDomainIsolated": false,
+    "componentType": "webpart"
+  }
+}