doc/man: Add high-level overview of the CDL process

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+.TH CDL 0 2020-09-04 "0.1" "The Corax Programming Environment"
+
+.SH INTRODUCTION
+
+The Corax Development Lifecycle is a security-focused software development process aimed at
+losely-structured projects such as free software projects. The purpose of this process is to
+improve the security posture of the project by emphasizing security activities such as threat
+modelling and risk analysis, and by mandating security documentation that allows users and
+developers to understand the security properties of the project.
+
+
+.SH THE PROCESS
+
+The CDL process attempts to consider the needs of agile software development through a recursive
+approach. At the highest level, the process is subdivided into three parts. The first part is the
+project inception, during which roles and responsibilities are assigned to key people, and the
+purpose of the project is defined.
+
+.PS
+move right 1.0
+down
+box "Project" "definition" width 1.2
+arrow
+D0: box "High-level" "design" width 1.2
+arrow
+box "Implementation" width 1.2
+arrow
+box "Verification" width 1.2
+arrow
+box "Release" width 1.2
+arrow
+box "Incident response" width 1.2
+
+arrow from D0.e up 0.1 right 0.6 dashed
+DD0: box "" width 1.2 dashed
+down
+arrow at DD0.s dashed
+box "" width 1.2 dashed
+arrow dashed
+VV0: box "" width 1.2 dashed
+arrow from VV0.w to D0.e dashed
+
+arrow from DD0.e right dashed
+DD1: box "" width 1.2 dashed
+down
+arrow at DD1.s dashed
+box "" width 1.2 dashed
+arrow dashed
+VV1: box "" width 1.2 dashed
+arrow from VV1.w to DD0.e dashed
+
+arrow right at D0.e
+D1: box "Component" "design" width 1.2 fill 0.1
+down
+arrow at D1.s
+box "Implementation" width 1.2 fill 0.1
+arrow
+V1: box "Verification" width 1.2 fill 0.1
+arrow from V1.w to D0.e
+arrow right at D1.e
+D2: box "Sub-component" "design" width 1.2 fill 0.1
+down
+arrow at D2.s
+box "Implementation" width 1.2 fill 0.1
+arrow
+V2: box "Verification" width 1.2 fill 0.1
+arrow from V2.w to D1.e
+.PE