Add odo installation docs (#4923)

* Add odo installation docs

* Remove individual installtion sections, organize code blocks, add missing links, and work on changes requested to the PR

* Change the release link

* Fix typos for windows installation

website/docs/getting-started/installation.md

@@ -2,3 +2,74 @@
 title: Installation
 sidebar_position: 4
 ---
+
+odo can be used as a CLI tool and as an IDE plugin; it can be run on Linux, Windows and Mac systems.
+
+## CLI Binary installation
+odo supports amd64 architecture for Linux, Mac and Windows.
+Additionally, it also supports amd64, arm64, s390x, and ppc64le architectures for Linux.
+
+See the [release page](https://developers.redhat.com/content-gateway/rest/mirror/pub/openshift-v4/clients/odo/latest/) for more information.
+
+### Installing odo on Linux/Mac
+```shell
+OS="$(uname | tr '[:upper:]' '[:lower:]')"
+ARCH="$(uname -m | sed -e 's/x86_64/amd64/' -e 's/\(arm\)\(64\)\?.*/\1\2/' -e 's/aarch64$/arm64/')"
+curl -L https://developers.redhat.com/content-gateway/rest/mirror/pub/openshift-v4/clients/odo/latest/odo-$OS-$ARCH -o odo
+sudo install odo /usr/local/bin/
+```
+
+### Installing odo on Windows
+1. Download the [odo-windows-amd64.exe](https://developers.redhat.com/content-gateway/rest/mirror/pub/openshift-v4/clients/odo/latest/odo-windows-amd64.exe) file.
+2. Rename the downloaded file to odo.exe and move it to a folder of choice, for example `C:\odo`.
+3. Add the location of odo.exe to `%PATH%` variable (refer to the steps below).
+
+#### Setting the PATH variable in Windows 10
+1. Click **Search** and type `env` or `environment`.
+2. Select **Edit environment variables for your account**.
+3. Select **Path** from the **Variable** section and click **Edit**.
+4. Click **New**, add the location where you copied the odo binary (e.g. `C:\odo` in [Step 2 of Installation](#installing-odo-on-windows) into the field or click **Browse** and select the directory, and click **OK**.
+
+#### Setting the PATH variable in Windows 7/8
+1. Click **Start** and in the Search box types `Advanced System Settings`.
+2. Select **Advanced systems settings** and click the **Environment Variables** button at the bottom.
+3. Select the **Path** variable from the **System variables** section and click **Edit**.
+4. Scroll to the end of the **Variable value** and add `;` followed by the location where you copied the odo binary (e.g. `C:\odo` in [Step 2 of Installation](#installing-odo-on-windows) and click **OK**.
+5. Click **OK** to close the **Environment Variables** dialog.
+6. Click **OK** to close the **System Properties** dialog.
+
+## Installing odo in Visual Studio Code (VSCode)
+The [OpenShift VSCode extension](https://marketplace.visualstudio.com/items?itemName=redhat.vscode-openshift-connector) uses both odo and oc binary to interact with Kubernetes or OpenShift cluster.
+1. Open VS Code.
+2. Launch VS Code Quick Open (Ctrl+P)
+3. Paste the following command:
+    ```shell
+     ext install redhat.vscode-openshift-connector
+    ```
+
+## Installing from source
+1. Clone the repository and cd into it.
+   ```shell
+   git clone https://github.com/openshift/odo.git
+   cd odo
+   ```
+2. Install tools used by the build and test system.
+   ```shell
+   make goget-tools
+   ```
+3. Build the executable from the sources in `cmd/odo`.
+   ```shell
+   make bin
+   ```
+4. Check the build version to verify that it was built properly.
+   ```shell
+   ./odo version
+   ```
+5. Install the executable in the system's GOPATH.
+   ```shell
+   make install
+   ```
+6. Check the binary version to verify that it was installed properly; verify that it is same as the build version.
+   ```shell
+   odo version
+   ```