Update docs and minor improvements

- add issue templates
- improve typos in README.md
- add ROADMAP.md

ROADMAP.md

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+# Jenkins Operator Roadmap
+
+This document outlines the vision and technical roadmap for [jenkinsci/kubernetes-operator](https://github.com/jenkinsci/kubernetes-operator) project.
+
+## Project Vision
+
+With Jenkins Operator project we want to enable our community to run Jenkins in cloud-native environments like Kubernetes, OpenShift and others. Also, support most of the public cloud providers (AWS, Azure, GCP) in terms of additional capabilities like backups, observability and cloud security.  
+
+
+With declarative configuration and full lifecycle management based on [Operator Framework](https://operatorframework.io/) this can become the de facto standard for running Jenkins on top of Kubernetes.
+
+
+Now, we have a dedicated team which can bring more engineering effort to the project.
+
+## Technical Roadmap
+
+- Upgrade Operator SDK [#494](https://github.com/jenkinsci/kubernetes-operator/issues/494)
+    - https://github.com/operator-framework/operator-sdk/releases/tag/v1.3.0
+- Modularise codebase and define areas of responsibility (AWS, Azure, OpenShift)
+- Break down Jenkins Custom Resource into smaller parts, support multiple Custom Resource Definitions [#495](https://github.com/jenkinsci/kubernetes-operator/issues/495)
+    - Introduce more granular schema for configuring Jenkins
+    - Introduce independent reconciliation controllers
+    - Refactor e2e tests to support testing individual reconciliation controller
+- Improve contribution process and establish governance model [#496](https://github.com/jenkinsci/kubernetes-operator/issues/496)
+    - Improve CONTRIBUTING.md
+    - Introduce architecture decision proposals process
+    - Introduce governance model
+- Migrate Jenkins instance from Pod to Deployment [#497](https://github.com/jenkinsci/kubernetes-operator/issues/497)
+    - Unblock easier integration with 3rd party systems e.g. sidecars injection
+- Reference Architecture - Jenkins on Kubernetes
+    - Bridge the gap between Jenkins and Kubernetes
+    - https://www.jenkins.io/blog/2020/12/04/gsod-project-report/
+- Pay technical debt
+    - Review existing issues on GitHub and prioritise them
+    - Introduce project board to track milestones
+    - Fix existing bugs
+
+## Have a Question?
+
+In case of further question feel free to create an issue or contact us directly.