add send_usd example for ton

Author: cctdaniel

price_feeds/ton/send_usd/.env.sample

@@ -0,0 +1,5 @@
+WALLET_VERSION="v4"
+WALLET_MNEMONIC=""
+TONCENTER_API_KEY="" # Get from https://toncenter.com/
+PYTH_CONTRACT_ADDRESS="EQB4ZnrI5qsP_IUJgVJNwEGKLzZWsQOFhiaqDbD7pTt_f9oU" 
+SEND_USD_CONTRACT_ADDRESS="EQBSXhaZHDbb7WRcdxXnmlFXsh_VDLJFSuFdWWV_FxxWFx-q"

price_feeds/ton/send_usd/.gitignore

@@ -0,0 +1,16 @@
+node_modules
+temp
+build
+dist
+.DS_Store
+
+# VS Code
+.vscode/*
+.history/
+*.vsix
+
+# IDEA files
+.idea
+
+# VIM
+Session.vim

price_feeds/ton/send_usd/.prettierignore

@@ -0,0 +1 @@
+build

price_feeds/ton/send_usd/.prettierrc

@@ -0,0 +1,7 @@
+{
+    "printWidth": 120,
+    "tabWidth": 4,
+    "singleQuote": true,
+    "bracketSpacing": true,
+    "semi": true
+}

price_feeds/ton/send_usd/README.md

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+# send_usd
+
+## Project structure
+
+-   `contracts` - source code of all the smart contracts of the project and their dependencies.
+-   `wrappers` - wrapper classes (implementing `Contract` from ton-core) for the contracts, including any [de]serialization primitives and compilation functions.
+-   `tests` - tests for the contracts.
+-   `scripts` - scripts used by the project, mainly the deployment scripts.
+
+## How to use
+
+### Build
+
+`npx blueprint build` or `yarn blueprint build`
+
+### Test
+
+`npx blueprint test` or `yarn blueprint test`
+
+### Deploy or run another script
+
+`npx blueprint run` or `yarn blueprint run`
+
+### Add a new contract
+
+`npx blueprint create ContractName` or `yarn blueprint create ContractName`