[libc][posix] add readme

mysterywolf · web-flow · commit 1a9729f45e52 · 2021-11-08T14:15:56.000-05:00
diff --git a/components/libc/compilers/readme.md b/components/libc/compilers/readme.md
@@ -0,0 +1 @@
+This folder provides uniformed header files crossing different compiler platforms, and supports basic standard C library functions, such as memory management and time management, etc.
diff --git a/components/libc/posix/readme.md b/components/libc/posix/readme.md
@@ -0,0 +1 @@
+This folder provides functions that are not part of the standard C library but are part of the POSIX.1 (IEEE Standard 1003.1) standard.

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	`1`	`+This folder provides uniformed header files crossing different compiler platforms, and supports basic standard C library functions, such as memory management and time management, etc.`
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	`1`	`+This folder provides functions that are not part of the standard C library but are part of the POSIX.1 (IEEE Standard 1003.1) standard.`