add contributing docs

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug or unexpected behavior with Temporalite
+title: ''
+labels: potential-bug
+assignees: ''
+
+---
+
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+1.
+1.
+1.
+
+## Specifications
+
+- Version:
+- Platform:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea or enhancement for Temporalite
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Describe what has changed in this PR -->
+**What changed?**
+
+
+<!-- Tell your future self why have you made these changes -->
+**Why?**
+
+
+<!-- How have you verified this change? Tested locally? Added a unit test? Checked in staging env? -->
+**How did you test it?**
+
+
+<!-- Assuming the worst case, what can be broken when deploying this change to production? -->
+**Potential risks**
+
+
+<!-- Is this PR a hotfix candidate or require that a notification be sent to the broader community? (Yes/No) -->
+**Is hotfix candidate?**

CONTRIBUTING.md

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+# Develop Temporalite
+This doc is for contributors to Temporalite (hopefully that's you!)
+
+[comment]: <> (TODO: CLA?)
+
+[comment]: <> (**Note:** All contributors also need to fill out the [Temporal Contributor License Agreement]&#40;https://gist.github.com/samarabbas/7dcd41eb1d847e12263cc961ccfdb197&#41; before we can merge in any of your changes.)
+
+## Prerequisites
+
+### Build prerequisites
+* [Go Lang](https://golang.org/) (minimum version required is 1.17):
+    - Install on macOS with `brew install go`.
+    - Install on Ubuntu with `sudo apt install golang`.
+
+## Check out the code
+Temporalite uses go modules, there is no dependency on `$GOPATH` variable. Clone the repo into the preferred location:
+```bash
+git clone https://github.com/DataDog/temporalite.git
+```
+
+## Build
+Build the `temporalite` binary:
+```bash
+go build ./cmd/temporalite
+```
+
+## Run tests
+Run all tests:
+```bash
+go test -race ./...
+```
+
+## Run Temporal Server locally
+Run the server in ephemeral mode:
+```bash
+go run ./cmd/temporalite start --ephemeral
+```
+
+Now you can create default namespace with `tctl`:
+```bash
+tctl --ns default namespace register
+```
+and run samples from [Go](https://github.com/temporalio/samples-go) and [Java](https://github.com/temporalio/samples-java) samples repos.
+
+When you are done, press `Ctrl+C` to stop the server.
+
+## License headers
+This project is Open Source Software, and requires a header at the beginning of
+all source files. To verify that all files contain the header execute:
+```bash
+go run ./internal/copyright
+```