Merge pull request #169 from tronprotocol/develop

Update README.md

CONTRIBUTING.md

@@ -0,0 +1,26 @@
+
+## Contributing
+
+Please follow these steps to contribute:
+
+1. Fork this repository.
+
+2. Clone your forked repository recursively to include submodules. 
+For example:
+```shell script
+git clone --recurse-submodules -j8 git@github.com:sullof/tronbox.git
+```
+3. If you use nvm for Node, install Node with a version higher than 8.0:
+```shell script
+nvm install v8.16.0
+nvm use v8.16.0
+```
+4. Install your project's dependencies:
+```shell script
+npm install
+```
+5. For better debugging during development, run the unbuilt version of TronBox. 
+For example:
+```shell script
+./tronbox.dev migrate --reset
+```

FURTHER_INFO.md

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+# Table of Contents
+- [Verifying the PGP signature](https://github.com/tronprotocol/tronbox/blob/master/FURTHER_INFO.md#verifying-the-pgp-signature)
+- [Tron Solidity versions supported by TronBox](https://github.com/tronprotocol/tronbox/blob/master/FURTHER_INFO.md#tron-solidity-versions-supported-by-tronbox)
+
+---
+
+## Verifying the PGP signature
+
+Follow these steps to verify the PGP signature:
+1. Install the npm [pkgsign](https://www.npmjs.com/package/pkgsign#installation).
+
+2. Get the version of tronbox dist.tarball
+
+```shell
+$ npm view tronbox dist.tarball
+https://registry.npmjs.org/tronbox/-/tronbox-2.7.25.tgz
+```
+3. Get the tarball
+
+```shell
+wget https://registry.npmjs.org/tronbox/-/tronbox-2.7.25.tgz
+```
+
+4. Verify the tarball
+
+```shell
+$ pkgsign verify tronbox-2.7.25.tgz --package-name tronbox
+extracting unsigned tarball...
+building file list...
+verifying package...
+package is trusted
+```
+You can find the signature public key [here](https://keybase.io/tronbox/pgp_keys.asc).
+
+## Tron Solidity Versions supported by TronBox
+
+```
+0.4.24
+0.4.25
+0.5.4
+0.5.8
+0.5.9
+0.5.10
+0.5.12
+0.5.13
+0.5.14
+0.5.15
+0.5.16
+0.5.17
+0.5.18
+0.6.0
+0.6.2
+0.6.8
+0.6.12
+0.6.13
+0.7.0
+0.7.6
+0.7.7
+0.8.0
+0.8.6
+0.8.7
+0.8.11
+```
+
+For more versions details: https://github.com/tronprotocol/solidity/releases