Add the README & logo.

Added a template for the environment variable for easier setup

.env.template

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+AUTHDOMAIN=https://<your-own-domain>.cloudflareaccess.com
+POLICYAUD=<YOUR_POLICY_AUD_TOKEN>
+FORWARDHEADER=X-WEBAUTH-USER
+FORWARDHOST=127.0.0.1:3000
+ADDR=:3001

README.md

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+# cloudflare-access-grafana
+
+![Docker pulls](https://badgen.net/docker/pulls/jorgelbg/cloudflare-access-grafana?icon=docker&color=purple)
+
+<p align="center">
+    <img class="center" src="logo.svg" width="150" alt="dissect-tester logo"/>
+</p>
+
+cloudflare-access-grafana is an HTTP proxy implemented to run as transparently behind [Cloudflare
+Access](https://teams.cloudflare.com/access/) and forward the email of the signed-in user to Grafana.
+Running this small proxy between Cloudflare Access and your Grafana instance allows you to
+automatically sign in the authenticated user from Cloudflare Access into Grafana.
+
+## 🎮 Installation / Getting started
+
+To accomplish this Grafana has to run in with the [Auth Proxy
+Authentication](https://grafana.com/docs/grafana/latest/auth/auth-proxy/) mode enabled. This will
+delegate the authentication to another component: Cloudflare Access + cloudflare-access-grafana in
+this case.
+
+A minimal `grafana.ini` config could look like this:
+
+```ini
+[users]
+allow_sign_up = false
+auto_assign_org = true
+auto_assign_org_role = Editor
+
+[auth.proxy]
+enabled = true
+header_name = X-WEBAUTH-USER
+header_property = email
+auto_sign_up = true
+```
+
+Running a Grafana docker container with the previous configuration can be done with the following command:
+
+```shell
+$ docker run --rm --name grafana -i -p 3000:3000 -v $(pwd)/grafana.ini:/etc/grafana/grafana.ini --name grafana grafana/grafana
+```
+
+In this case, the `header_property` set to `email` is important because the email is the claim
+that we get from the JWT token provided by Cloudflare Access. `header_name` can be configured to any
+desired value and will need to match the `FORWARDHEADER` environment variable passed into
+cloudflare-access-grafana.
+
+You can copy the template from [.env.template](.env.template) into your environment file and adjust
+the required values. Now you can run the cloudflare-access-grafana container with the following command:
+
+```
+$ cp .env.template .env
+$ docker run --rm -d --env-file $(pwd)/.env --name cloudflare-proxy -p 3001:3001 jorgelbg/cloudflare-access-grafana
+```
+
+This will start the proxy on the specified address and it will start to listen for incoming requests.
+When a new HTTP request is received it will validate the JWT token, extract the `email` claim from
+the token and forward to the specified host the header with the email address. Grafana will then
+automatically signup/sign in (depending on the configuration) the user.
+
+> Additional configuration on the Cloudflare Access is required to route your subdomain/DNS entry
+> into the cloudflare-access-grafana instance. Grafana doesn't need to be accessible externally since
+> all requests will go through the proxy.
+
+### Known Issues
+
+* Since the authentication is no longer on the Grafana side, the logout action will not work as
+  expected. Although it will execute normally, you will find yourself logged in again. This happens
+  because the current user has not been logged out of Cloudflare Access.
+
+## 🛠 Configuration
+
+All the configuration options are passed to cloudflare-access-proxy as environment variables:
+
+* `AUTHDOMAIN`: This is your cloudflare authentication domain. Normally in the form of `https://<your-own-domain>.cloudflareaccess.com`.
+* `POLICYAUD`: Application Audience (AUD) Tag.
+* `FORWARDHEADER`: The header to be forwarded to Grafana to indicate which user is currently logged in.
+* `FORWARDHOST`: URL where the Grafana instance (with `auth.proxy` enabled) is running.
+* `ADDR`: Address where the cloudflare-access-proxy will listen for incoming connections.
+
+## 👨🏻‍💻 Developing
+
+```shell
+git clone https://github.com/jorgelbg/dissect-tester
+cd cloudflare-access-grafana/
+make
+```
+
+This will build a binary placed in `bin/github.com/jorgelbg/cloudflare-access-grafana` for your native platform.
+
+If you want to build a new Docker image use the following command:
+
+```shell
+make docker
+```
+
+## 🤚🏻 Contributing
+
+If you'd like to contribute, please fork the repository and use a feature
+branch. Pull requests are warmly welcome.
+
+## 🚀 Links
+
+- The project logo is based on [Cloudflare icon](https://icons8.com/icons/set/cloudflare) by [Icons8](https://icons8.com). And the [Grafana icon](https://grafana.com/).