add proccessing instruction example

basics/processing-instructions/poseidon/.gitignore

@@ -0,0 +1,8 @@
+.anchor
+.DS_Store
+target
+**/*.rs.bk
+node_modules
+test-ledger
+Cargo.lock
+.yarn

basics/processing-instructions/poseidon/Anchor.toml

@@ -0,0 +1,18 @@
+[toolchain]
+
+[features]
+resolution = true
+skip-lint = false
+
+[programs.localnet]
+processing_instructions = "6Ra6xuBTuL8ytoHsGEzaAQcHHqNyGjjzemHpFyYrpGdV"
+
+[registry]
+url = "https://api.apr.dev"
+
+[provider]
+cluster = "Localnet"
+wallet = "~/.config/solana/id.json"
+
+[scripts]
+test = "pnpm ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"

basics/processing-instructions/poseidon/Cargo.toml

@@ -0,0 +1,14 @@
+[workspace]
+members = [
+    "programs/*"
+]
+resolver = "2"
+
+[profile.release]
+overflow-checks = true
+lto = "fat"
+codegen-units = 1
+[profile.release.build-override]
+opt-level = 3
+incremental = false
+codegen-units = 1

basics/processing-instructions/poseidon/package.json

@@ -0,0 +1,17 @@
+{
+  "dependencies": {
+    "@coral-xyz/anchor": "^0.30.0",
+    "@solana/web3.js": "^1.95.2"
+  },
+  "devDependencies": {
+    "anchor-bankrun": "^0.4.0",
+    "solana-bankrun": "^0.3.0",
+    "@types/bn.js": "^5.1.0",
+    "@types/chai": "^4.3.0",
+    "@types/mocha": "^9.0.0",
+    "chai": "^4.3.4",
+    "mocha": "^9.0.3",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^4.3.5"
+  }
+}