checksec: add page (#10638)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/checksec.md

@@ -0,0 +1,20 @@
+# checksec
+
+> Check security properties of executables.
+> More information: <https://github.com/slimm609/checksec.sh>.
+
+- List security properties of an executable binary file:
+
+`checksec --file={{path/to/binary}}`
+
+- List security properties recursively of all executable files in a directory:
+
+`checksec --dir={{path/to/directory}}`
+
+- List security properties of a process:
+
+`checksec --proc={{pid}}`
+
+- List security properties of the running kernel:
+
+`checksec --kernel`