feat(issues): [templates] Add Issue Templates

.github/ISSUE_TEMPLATE/development.md

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+---
+name: Development Issue
+about: Report an issue encountered while working on code found in this repository.
+title: "[DEVEL] <replace with issue title>"
+labels: 'Development'
+assignees: ''
+
+---
+
+**Description**
+[replace this line with a clear and concise description of the development issue you are experiencing]
+
+**Your Environment**
+[replace this line with basic information about your environment, such as your operating system and the versions of any relevant tools you are using (e.g. Go, Docker)]
+
+**Basic Information**
+[replace this line with basic information about the issue you are experiencing, including but not limited to the names of the files you are working with and any relevant error messages]
+
+**Steps to Reproduce**
+[replace this line with detailed steps to reproduce the issue you are experiencing]
+
+**Additional Information**
+[replace this line with any additional information you would like to provide, such as screenshots illustrating the issue]

.github/ISSUE_TEMPLATE/explorer.md

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+---
+name: Explorer Issue
+about: Report an issue with the Chainlink Explorer.
+title: "[EXPLR] <replace with issue title>"
+labels: 'Explorer'
+assignees: ''
+
+---
+
+**Description**
+[replace this line with a clear and concise description of the Chainlink Explorer issue you are experiencing]
+
+**Basic Information**
+[replace this line with basic information about the issue you are experiencing, including but not limited to the name and version of your web browser and the value you are searching for]
+
+**Steps to Reproduce**
+[replace this line with detailed steps to reproduce the issue you are experiencing]
+
+**Additional Information**
+[replace this line with any additional information you would like to provide, such as screenshots illustrating the issue]

.github/ISSUE_TEMPLATE/faucet.md

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+---
+name: Faucet Issue
+about: Report an issue with a Chainlink LINK Faucet.
+title: "[FAUC] <replace with issue title>"
+labels: 'Faucet'
+assignees: ''
+
+---
+
+**Description**
+[replace this line with a clear and concise description of the Chainlink LINK Faucet issue you are experiencing]
+
+**Basic Information**
+[replace this line with basic information about the issue you are experiencing, including but not limited to your testnet address, the name and version of your web browser and wallet, and the link to the faucet transaction on Etherscan]
+
+**Steps to Reproduce**
+[replace this line with detailed steps to reproduce the issue you are experiencing]
+
+**Additional Information**
+[replace this line with any additional information you would like to provide, such as screenshots illustrating the issue]

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Request a feature. Help us make Chainlink better!
+title: "[FEAT] <replace with feature title>"
+labels: 'Feature Request'
+assignees: ''
+
+---
+
+**Description**
+[replace this line with a clear and concise description of the feature you are requesting]
+
+**Motivation**
+[replace this line with a clear and concise explanation of _why_ you are requesting this feature]
+
+**Justification**
+[replace this line with a clear and concise explanation of _why_ the feature you are requesting is the best way to approach this issue and list other approaches you considered]
+
+**Additional Information**
+[replace this line with any additional information you would like to provide, such as examples or screenshots of similar features]

.github/ISSUE_TEMPLATE/node-operator.md

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+---
+name: Node Operator Issue
+about: Report an issue encountered while operating a Chainlink node.
+title: "[NODE] <replace with issue title>"
+labels: 'Node Operator'
+assignees: ''
+
+---
+
+**Description**
+[replace this line with a clear and concise description of the issue you are experiencing]
+
+**Basic Information**
+[replace this line with basic information about the issue you are experiencing, including but not limited to all relevant logs and any other relevant information, such as if you are using a Docker container to run the node, job specification, oracle contract address, transaction IDs, etc.]
+ - Network: [e.g. Ethereum Mainnet, Ropsten]
+ - Blockchain Client: [name and version of blockchain client e.g. Geth v1.9.6]
+ - Go Version: [e.g. v1.12]
+ - Operating System: [name and version of operating system running Chainlink node]
+ - Commit: [log INFO line when starting node]
+ - Hosting Provider: [e.g. AWS, GCP, self-hosted]
+
+**Environment Variables**
+[replace this line with the output of the environment variables when running the node in debug mode]
+
+**Steps to Reproduce**
+[replace this line with detailed steps to reproduce the issue you are experiencing]
+
+**Additional Information**
+[replace this line with any additional information you would like to provide, such as screenshots illustrating the issue]

.github/ISSUE_TEMPLATE/smart-contract.md

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+---
+name: Smart Contract Issue
+about: Report an issue with smart contracts found in this repository.
+title: "[SMRT] <replace with issue title>"
+labels: 'Smart Contract'
+assignees: ''
+
+---
+
+**Description**
+[replace this line with a clear and concise description of the smart contract issue you are experiencing]
+
+**Basic Information**
+[replace this line with basic information about the issue you are experiencing, including but not limited to the names of the smart contract files and the version of the Chainlink software repository in which they are found, contract addresses, transaction IDs, etc.]
+
+**Steps to Reproduce**
+[replace this line with detailed steps to reproduce the issue you are experiencing]
+
+**Additional Information**
+[replace this line with any additional information you would like to provide, such as screenshots illustrating the issue]