Add task notify-matrix

This PR adds a new task, `notify-matrix` which sends messages to a [Matrix](https://matrix.org/) room on its corresponding endpoint.

task/notify-matrix/0.1/README.md

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+# `notify-matrix`
+
+The `notify-marix` `Task` sends messages to a [Matrix](https://matrix.org/) room on its corresponding endpoint.
+
+## Parameters 
+
+This `Task` has the following required inputs:
+
+1. **`matrix-secret`**: the name of a secret, containing a valid matrix access token (see below)
+2. **`room`**: the matrix roomID where the notification will be sent, in the format `#ROOM_NAME:SERVER_NAME`
+3. **`endpoint`**: URI of the matrix server to connect and send the message from
+4. **`message`**: the message to be sent
+
+## Setting up the `matrix-secret`
+
+In order for the task to be able to send a message to the selected matrix room, make sure you create a secret, of type generic. It should contain a key `token`, containing the access token to the matrix endpoint.
+
+Ex: 
+```yaml
+kind: Secret
+apiVersion: v1
+metadata:
+  name: matrix-access-token
+stringData:
+  token: {OAuth token for the user/bot with access to the room}
+```
+
+## Platforms
+
+The Task can be run on `linux/amd64`, `linux/s390x`, `linux/386`, and `linux/ppc64le` platforms.
+
+## Usage
+
+[This TaskRun](./samples/notify-matrix-run.yaml) demonstrate usage of the notify-matrix Task.
+

task/notify-matrix/0.1/notify-matrix.yaml

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+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: notify-matrix
+  labels:
+    app.kubernetes.io/version: "0.1"
+  annotations:
+    tekton.dev/pipelines.minVersion: "0.12.1"
+    tekton.dev/categories: Messaging
+    tekton.dev/tags: messaging
+    tekton.dev/platforms: "linux/386,linux/amd64,linux/s390x,linux/ppc64le"
+spec:
+  description: >-
+    These tasks post a simple message to a matrix room.
+    This task uses Matrix's Client-Server REST api to send the message.
+  params:
+  - name: matrix-secret
+    type: string
+    description: secret name containing matrix access token (key is token)
+  - name: room
+    type: string
+    description: room id (in the format !<ROOM_ID>:<SERVER_NAME>)
+  - name: endpoint
+    type: string
+    description: Matrix server URL to which to send the message
+  - name: message
+    type: string
+    description: plain text message
+  steps:
+  - name: post
+    image: docker.io/curlimages/curl:7.70.0@sha256:031df77a11e5edded840bc761a845eab6e3c2edee22669fb8ad6d59484b6a1c4 #tag: 7.70.0
+    script: |
+      #!/usr/bin/env bash
+      if [[ -z "$(params.room)" || -z "$(params.endpoint)" ]]; then
+        echo "No Matrix parameters found - no notification sent"
+      else
+        /usr/bin/curl -X POST -H 'Content-type: application/json' --data '{"msgtype":"m.text", "body":"$(params.message)"}' https://$(params.endpoint)/_matrix/client/r0/rooms/$(params.room)/send/m.room.message?access_token=$TOKEN
+      fi
+    env:
+    - name: TOKEN
+      valueFrom:
+        secretKeyRef:
+          name: $(params.matrix-secret)
+          key: token

task/notify-matrix/0.1/samples/matrix-access-token.yaml

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+kind: Secret
+apiVersion: v1
+metadata:
+  name: matrix-access-token
+stringData:
+  token: {OAuth token for the bot app}

task/notify-matrix/0.1/samples/notify-matrix-run.yaml

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+apiVersion: tekton.dev/v1beta1
+kind: TaskRun
+metadata:
+  name: notify-matrix-run
+spec:
+  params:
+  - name: matrix-secret
+    value: matrix-access-token
+  - name: room
+    value: "!yKXXPqFwfCOTipZMxp:matrix.org"
+  - name: endpoint
+    value: matrix.org
+  - name: message
+    value: hello
+  resources: {}
+  serviceAccountName: default
+  taskRef:
+    kind: Task
+    name: notify-matrix
+  timeout: 1h0m0s

task/notify-matrix/OWNERS

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+approvers:
+- sherine-k
+reviewers:
+- sherine-k