Add devfile (#2)

* Add the devfile

* Add CONTRIBUTING.md file

---------

Signed-off-by: vitaliy-guliy <[email protected]>
Co-authored-by: Mario Loriedo <[email protected]>

Author: vitaliy-guliy

CONTRIBUTING.md

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+Contribute to VS Code Devfile extension
+================
+
+### Step 1 : Open this repository in an Eclipse Che cloud development environment
+
+Use this GitHub repository URL in Eclipse Che Dashboard or in a direct link `https://<che-hostname>/#https://github.com/vitaliy-guliy/vscode-devfile/`.
+
+Click on the link below to open it in Red Hat Developer Sandbox:
+
+[![Contribute](https://img.shields.io/static/v1?label=Open%20in%20Red%20Hat%20Developer%20Sandbox...&message=Free%20as%20free%20🍺%20and%20free%20💬..&logo=eclipseche&color=FDB940&labelColor=525C86)](https://workspaces.openshift.com#https://github.com/vitaliy-guliy/vscode-devfile/)
+
+### Step 2 : Compile extension
+
+The first you need to install node dependencies by running the task `devfile: Install dependencies`.
+The task progress will be shown in VS Code Terminal output.
+
+Once dependencies have been installed, compile the extension with task `devfile: Compile`.
+It will create an `out` directory containing the compiled extension.
+
+### Step 3 : Run the extension in separte VS Code instance
+
+Now you can test the extension in a separate VS Code instance.
+
+> Note that it is not possible to launch the extension until you compile it as described in step 2.
+
+To run a separate VS Code instance focus the editor or the `Explorer`, press `F5`. After a few seconds VS Code starts a separate instance in a new browser tab.
+
+In the new VS Code instance a `Welcome` tab is opened with a link to the `Get Started with Devfile` VS Code Walkthrough.
+If the VS Code Walkthrough link is not there try expanding the Walkthroughs by clicking `More...` on the right.
+
+### Step 4 : Build `vsix` binary
+
+Run task `devfile: Build vsix binary` to build the extension binary.
+
+In a terminal you may be warned with a message below:
+
+>  **WARNING**  Using '*' activation is usually a bad idea as it impacts performance.
+
+Just type `y` to the terminal and press `Enter` to confirm the build.
+
+When build finished, a new file `redhat-vscode-devfile-0.0.1.vsix` will appear in the project root.
+
+The file can be downloaded and used in other local or remote VS Code instances.
+
+> Installing a vsix binary in VS Code is easy: drag and drop the file into the `Extensions` view.

devfile.yaml

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+schemaVersion: 2.2.0
+metadata:
+  name: vscode-devfile
+components:
+  - name: tools
+    container:
+      image: quay.io/devfile/universal-developer-image:ubi8-latest
+      memoryRequest: 1G
+      memoryLimit: 4G
+      cpuRequest: '1'
+      cpuLimit: '2'
+
+commands:
+  - id: install-dependencies
+    exec:
+      label: "Install dependencies"
+      component: tools
+      commandLine: "npm install"
+
+  - id: compile
+    exec:
+      label: "Compile"
+      component: tools
+      commandLine: "npm run compile"
+      group:
+        kind: build
+        isDefault: true
+
+  - id: build-vsix
+    exec:
+      label: "Build vsix binary"
+      component: tools
+      commandLine: "npm run build-vsix"
+      group:
+        kind: build
+        isDefault: false