Create an extras directory with files that are not related to the build but that I need to keep around for reference.

PPP3/README.md

@@ -53,16 +53,29 @@ thing that failed on the build was `libgit2/src/utils/process.h` had several err
 missing types.  To keep this description short here's the patch I crafted that solved the problem:
 
 ```diff
-10a11,12
-> typedef struct git_str git_str;
->
-115,118c117
-< GIT_INLINE(bool) git_process__is_cmdline_option(const char *str)
-< {
-< 	return (str && str[0] == '-');
-< }
----
-> #define git_process__is_cmdline_option(str) ((str) && (str[0]) == '-')
+--- subprojects/libgit2-1.8.0/src/util/process.h	2024-03-20 16:19:37.000000000 -0400
++++ process.h	2024-05-09 08:05:48.279986200 -0400
+@@ -8,6 +8,8 @@
+ #ifndef INCLUDE_process_h__
+ #define INCLUDE_process_h__
+ 
++typedef struct git_str git_str;
++
+ typedef struct git_process git_process;
+ 
+ typedef struct {
+@@ -112,10 +114,7 @@
+  * cmdline arguments to ensure that they are not erroneously treated
+  * as an option. For example, arguments to `ssh`.
+  */
+-GIT_INLINE(bool) git_process__is_cmdline_option(const char *str)
+-{
+-	return (str && str[0] == '-');
+-}
++#define git_process__is_cmdline_option(str) ((str) && (str[0]) == '-')
+ 
+ /**
+  * Start the process.
 ```
 
 What's even stranger is that the compilation errors _only_ showed up when I included any C++
@@ -83,7 +96,7 @@ int main(int argc, char *argv[])
 }
 ```
 
-What's wile is do you see how I have a `test_libgit2` function and I'm including a `libgit2-test.h`
+What's wild is do you see how I have a `test_libgit2` function and I'm including a `libgit2-test.h`
 file?  I even went so far as to place all of the `libgit2` code into a separate compilation unit to
 firewall it off and the bug _STILL_ showed up.  That `libgit2-test.h` header had absolutely zero
 `libgit2` headers or definitions. It only had the one `test_libgit2` function in it.