docs: Add missed pull request docs

Author: dimhotepus

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,41 @@
+<!--
+Before submitting a pull request, please read:
+
+- the CONTRIBUTING guide at https://github.com/Source-Authors/Obsoletium/blob/HEAD/CONTRIBUTING.md
+- the commit message formatting guidelines at
+  https://github.com/Source-Authors/Obsoletium/blob/HEAD/docs/contributing/PULL_REQUESTS.md#commit-message-guidelines
+
+For code changes:
+1. Include tests for any bug fixes or new features.
+2. Update documentation if relevant.
+3. Ensure that tests pass.
+
+If you believe this PR should be highlighted in the Obsoletium CHANGELOG
+please add the `notable-change` label.
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+-->

BUILDING.md

@@ -117,6 +117,8 @@ Binaries at <https://github.com/Source-Authors/Obsoletium/releases> are produced
 
 To run the games you need to _own_ ones. Check Steam store pages for Half-Life 2, Half-Life 2 Episode 1/2 or Portal and buy them. **Note you need ```steam_legacy``` branch for Half-Life 2 and episodes, as [`20th Anniversary Update`](https://www.half-life.com/en/halflife2/20th) not supported *yet***.
 
+### Windows
+
 #### Windows Prerequisites
 
 * Git. Follow [`Git downloads`](https://git-scm.com/downloads).

docs/contributing/ARCHITECTURE_INTERNALS.md

@@ -8,6 +8,7 @@ The **Obsoletium** repository on GitHub contains several top-level folders, each
 |-----------------------|-----------------------------------------------------------------------------------------------------|
 | **appframework**      | Source code for basic applications using the Obsoletium platform. |
 | **bitmap**            | Image format conversions, resampling and PSD, TGA files support. |
+| **build**             | App version resources and manifests. |
 | **choreoobjects**     | Choreo actors, channels, events and scenes. |
 | **common**            | Contains the source code for common things. Slowly being removed / moved. |
 | **datacache**         | Data caching functionality. |
@@ -20,7 +21,6 @@ The **Obsoletium** repository on GitHub contains several top-level folders, each
 | **docs**              | Holds documentation files that provide guidance on using and contributing to the project. This may include setup instructions, API references, and user guides. |
 | **dx9sdk**            | DirectX 9 SDK files which are not distributed by Windows SDK. |
 | **dx11sdk**           | DirectX 11 SDK binaries used for shader compiling. |
-| **dx11sdk**           | DirectX 11 SDK binaries used for shader compiling. |
 | **engine**            | Engine to run the game app. |
 | **external**          | External things needed for compilation. |
 | **fgdlib**            | Game definition files parser library. |